Hindu law has the oldest pedigree of any known
system of jurisprudence, and even now it shows no
  sign of decrepitude.”- Henry Mayne.
  Origins of Hindu Law
  It is believed that Hindu law is a divine law. It was
  revealed to the people by God through Vedas. Various
  sages and ascetics have elaborated and refined the
  abstract concepts of life explained in the Vedas. From
  thousands of years people living in the Indian
  subcontinent have been leading their lives by
  following the guidelines and concepts given in the
  Vedas.
  These guidelines have evolved into rules followed by
  the people and enforced by the rulers and have thus
  become de facto law. In this modern times, the same
  laws have been retrofitted to suit present conditions
  and have been codified in the form of several acts of
  which the important ones are - Hindu Marriage Act
  1955, Hindu Adoption and Maintenance Act 1956,
  Hindu Minority and Guardianship Act 1956, and Hindu
  Succession Act 1956.
  Source of Law:
  The phrase “source of law” has several connotations.
  It may be the authority which issues rules of conduct
  which are recognized by Courts as binding.
In this context, ‘source of law’ means ‘the maker of
  law’. It may mean the social conditions which inspires
  the making of law for the governance of the
  conditions.
In this context it means ‘cause of law’. It may also
  mean in its literal sense the material from which the
  rules and laws are known.
In this sense the expression means the ‘evidence of
  law’ and it is in this sense that the expression ‘source
  of law’ is accepted in Jurisprudence.
  Vijnaneshwar (commentator on the Yajnavalkya Smriti
  and founder of Mitakshara School) has called it
  Jnapak Hetu i.e., the means of knowing law. It is
  important to study the sources of law because in
  every personal legal system only that rule is law
  which has place in its sources. A rule not laid down or
  not recognized in the sources is not a rule in that legal
  system.
  The word ‘Hindu’ first appeared in the Old Persian
  language which was derived from the Sanskrit word
  Sindhu, the historic local designation for the Indus
  River in the north-western part of the Indian
  subcontinent. A Hindu is an adherent of Hinduism.
  Hindu law is a set of personal laws governing the
  social conditions of Hindus (such as marriage and
  divorce,     adoption,    inheritance,   minority    and
  guardianship, family matters, etc.). It is not Hindus
  alone who must follow Hindu law but there are several
  other communities and religious denominations that
  are subject to its dominion such as Jains, Buddhists,
  Sikhs, Brahmo-Samajists, Prarthana-Samajists, the
  Virashaivas and Lingayats and the Santhals of Chhota
  Nagpur besides others.
  In Sir Dinshah F.Mulla’s ‘Principles of Hindu Law’, the
  learned editor has defined ‘Hindu law’ in the following
     words: “Wherever the laws of India admit operation of
     a personal law, the rights and obligations of a Hindu
     are determined by Hindu law, i.e. his traditional law,
     sometimes called the law of his religion, subject to the
     exception that any part of that law may be modified or
     abrogated by statute.” Law as understood by Hindus
     is a branch of dharma.
     Nature and scope:
     In this article, the scope will be restricted to finding
     out the sources of Hindu law, and critique on some of
     the definitional aspects of the sources and a general
     critique of the sources.
     Sources of Hindu Law:
     The sources of Hindu law can be classified under the
     following two heads:
  I.     Ancient Sources
     Under this would come the following:
1.        Shruti
2.        Smriti
3.        Digests and Commentaries and
4.        Custom.
     II. Modern Sources
     Under this head would come:
1.        Justice, equity and good conscience
2.        Precedent, and
3.        Legislation.
     Ancient Sources
     Ancient Sources: Before the codification of Hindu
     Law, the ancient literature was the only source of the
     law. These sources can be divided into four
     categories:
   (i) Shruti-
   It literally means that which has been heard. The word
   is derived from the root “shru” which means ‘to hear’.
   In theory, it is the primary and paramount source of
   Hindu law and is believed to be the language of the
   divine revelation through the sages.
   Shruti: Shruti means "what is heard". It is believed
   that the rishis and munis had reached the height of
   spirituality where they were revealed the knowledge of
   Vedas. Thus, shrutis include the four vedas - rig,
   yajur, sam, and athrava along with their brahmanas.
   The brahmanas are like the apendices to the Vedas.
   Vedas primarily contain theories about sacrifices,
   rituals, and customs. Some people believe that Vedas
   contain no specific laws, while some believe that the
   laws have to be inferred from the complete text of the
   Vedas.
   The synonym of shruti is veda. It is derived from the
   root “vid” meaning ‘to know’. The term Veda is based
   on the tradition that they are the repository of all
   knowledge. Since vedas had a divine origin, the
   society was governed as per the theories given in
   vedas and they are considered to be the fundamental
   source of Hindu law.
   Shrutis basically describe the life of the Vedic people.
   There are four Vedas namely:
1. Rig Veda (containing hymns in Sanskrit to be recited
   by the chief priest),
2. Yajurva Veda (containing formulas to be recited by the
   officiating priest),
3. Sama Veda (containing verses to be chanted by seers)
   and
4. Atharva Veda (containing a collection of spells and
   incantations, stories, predictions, apotropaic charms
   and some speculative hymns).
   Each Veda has three parts viz.
1. Sanhita (which consists mainly of the hymns),
2. Brahmin (tells us our duties and means of performing
   them) and
3. Upanishad (containing the essence of these duties).
   The shrutis include the Vedas along with their
   components. The brahmanas are like the apendices to
   the Vedas. Vedas primarily contain theories about
   sacrifices, rituals, and customs.
   Some people believe that Vedas contain no specific
   laws, while some believe that the laws have to be
   inferred from the complete text of the Vedas.
   Vedas do refer to certain rights and duties, forms of
   marriage, requirement of a son, exclusion of women
   from inheritance, and partition but these are not very
   clearcut laws.
   During the vedic period, the society was divided into
   varns and life was divided into ashramas. The concept
   of karma came into existence during this time. A
   person will get rewarded as per his karma. He can
   attain salvation through "knowledge". During this
   period the varna system became quite strong.
   The vedic period is assumed to be between 4000 to
   1000 BC. During this time, several pre-smriti sutras
   and gathas were composed. However, not much is
   known about them today. It is believed that various
   rishis and munis incorporated local customs into
   Dharma and thus multiple "shakhas" came into
   existence.
   (ii) Smritis-
   The word Smriti is derived from the root “smri”
   meaning ‘to remember’. Traditionally, Smritis contain
   those portions of the Shrutis which the sages forgot
   in their original form and the idea whereby they wrote
   in their own language with the help of their memory.
   Thus, the basis of the Smritis is Shrutis but they are
   human works.
   There are two kinds of Smritis viz. Dharmasutras and
   Dharmashastras. Their subject matter is almost the
   same. The difference is that the Dharmasutras are
   written in prose, in short maxims (Sutras) and the
   Dharmashastras are composed in poetry (Shlokas).
   However, occasionally, we find Shlokas in
   Dharmasutras and Sutras in the Dharmashastras. In a
   narrow sense, the word Smriti is used to denote the
   poetical Dharmashastras.
   The number of Smriti writers is almost impossible to
   determine but some of the noted Smriti writers
   enumerated by Yajnavalkya (sage from Mithila and a
   major figure in the Upanishads) are Manu, Atri,
   Vishnu, Harita, Yajnavalkya, Yama, Katyayana,
   Brihaspati, Parashar, Vyas, Shankh, Daksha,
   Gautama, Shatatapa, Vasishtha, etc.
   The rules laid down in Smritis can be divided into
   three categories viz.
1.     Achar (relating to morality),
 2.     Vyavahar (signifying procedural and substantive
     rules which the King or the State applied for settling
     disputes in the adjudication of justice) and
  3.    Prayaschit (signifying the penal provision for
     commission of a wrong).
     Smrit means "what is remembered". With smrutis, a
     systematic study and teaching of Vedas started. Many
     sages, from time to time, have written down the
     concepts given in Vedas. So it can be said that
     Smrutis are a written memoir of the knowledge of the
     sages. Immediately after the Vedic period, a need for
     the regulation of the society arose. Thus, the study of
     vedas and the incorporation of local culture and
     customs became important. It is believed that many
     smrutis were composed in this period and some were
     reduced into writing, however, not all are known.
     The smrutis can be divided into two –
I.        Early smritis (Dharmasutras) and
II.       Later smritis (Dharmashastras).
     Dharmasutras:
     The Dharmansutras were written during 800 to 200
     BC. They were mostly written in prose form but also
     contain verses. It is clear that they were meant to be
     training manuals of sages for teaching students. They
     incorporate the teachings of Vedas with local
     customs. They generally bear the names of their
     authors and sometime also indicate the shakhas to
     which they belong. Some of the important sages
     whose dharmasutras are known are: Gautama,
     Baudhayan, Apastamba, Harita, Vashistha, and
     Vishnu.
    They explain the duties of men in various relationship.
    They do not pretend to be anything other than the
    work of mortals based on the teachings of Vedas, and
    the legal decisions given by those who were
    acquainted with Vedas and local customs.
    Gautama - He belonged to Samveda school and deals
    exclusively with legal and religious matter. He talks
    about inheritance, partition, and stridhan.
    Baudhayan - He belonged to the Krishna Yajurved
    school and was probably from Andhra Pradesh. He
    talks about marriage, sonship, and inheritance. He
    also refers to various customs of his region such as
    marriage to maternal uncle's daughter.
    Apastamba - His sutra is most preserved. He also
    belonged to Krishna Yajurveda school from Andhra
    Pradesh. His language is very clear and forceful. He
    rejected prajapatya marriage.
    Vashistha - He was from North India and followed the
    Rigveda school. He recognized remarriage of virgin
    widows.
    Dharmashastras:
    Dharmashastras were mostly in metrical verses and
    were based of Dharmasutras. However, they were a lot
    more systematic and clear. They dealt with the subject
    matter in three parts
   Aachara : This includes the theories of religious
    observances,
   Vyavahar : This includes the civil law.
   Prayaschitta : This deals with penance and expiation.
    The Hindu Marriage Act, 1955,
    The Hindu Adoptions and Maintenance Act, 1956,
1.   The Hindu Succession Act, 1956,
    The Hindu Minority and Guardianship Act, 1956, etc.
     Modern Sources of Hindu Law:
     While early smrutis deal mainly with Aachara and
     Prayaschitta, later smrutis mainly dealt with Vyavahar.
     Out of many dharmashastras, three are most
     important.
     Manusmriti:
     This is the earliest and most important of all. It is not
     only defined the way of life in India but is also well
     known in Java, Bali, and Sumatra. The name of the
     real author is not known because the author has
     written it under the mythical name of Manu, who is
     considered to the first human. This was probably
     done to increase its importance due to divine origin.
     Manusmriti compiles all the laws that were scattered
     in pre-smriti sutras and gathas. He was a brahman
     protagonist and was particularly harsh on women and
     sudras. He holds local customs to be most important.
     He directs the king to obey the customs but tries to
     cloak the king with divinity. He gives importance to
     the principle of 'danda' which forces everybody to
     follow the law. Manusmriti was composed in 200 BC.
     There have been several commentaries on this smruti.
     The main ones are: Kalluka's Manavarthmuktavali,
     Meghthithi's     Manubhashya,      and     Govindraja's
     Manutika.
Yajnavalkya Smriti:
Though written after Manusmruti, this is a very
important smruti. Its language is very direct and clear.
It is also a lot more logical. He also gives a lot of
importance to customs but hold the king to be below
the law. He considers law to be the king of kings and
the king to be only an enforcer of the law. He did not
deal much with religion and morality but mostly with
civil law. It includes most of the points given in
Manusmriti but also differs on many points such as
position of women and sudras. He was more liberal
than Manu. This was composed in around 0 BC.
Vijnaneshwar's commentary 'Mitakshara' on this
smruti, is the most important legal treatise followed
almost everywhere in India except in West Bengal and
Orissa.
Narada Smriti:
Narada was from Nepal and this smriti is well
preserved and its complete text is available. This is
the only smriti that does not deal with religion and
morality at all but concentrates only on civil law. This
is very logical and precise. In general, it is based on
Manusmriti and Yajnavalkya smriti but differ on many
points due to changes in social structure. He also
gives a lot of importance to customs. This was
composed in 200 AD.
(iii) Digests and Commentaries-
After Shrutis came the era of commentators and
digests. Commentaries (Tika or Bhashya) and Digests
(Nibandhs) covered a period of more than thousand
years from 7th century to 1800 A.D. In the first part of
the period most of the commentaries were written on
the Smritis but in the later period the works were in
the nature of digests containing a synthesis of the
various Smritis and explaining and reconciling the
various contradictions.
The evolution of the different schools of Hindu law
has been possible on account of the different
commentaries that were written by various authorities.
The original source of Hindu law was the same for all
Hindus. But schools of Hindu law arose as the people
chose to adhere to one or the other school for
different reasons.
After 200 AD, most of the work was done only on the
existing material given in Smrtis. The work done to
explain a particular smriti is called a commentary.
Commentaries were composed in the period
immediately after 200 AD. Digests were mainly written
after that and incorporated and explained material
from all the smritis.
As noted ealier, some of the commentaries were,
manubhashya, manutika, and mitakshara. While the
most important digest is Jimutvahan's Dayabhag that
is applicable in the Bengal and Orissa area.
Mitakshara literally means 'New Word' and is
paramount source of law in all of India. It is also
considered important in Bengal and orissa where it
relents only where it differs from dayabhaga. It is a
very exhaustive treaties of law and incorporates and
irons out contradicts existing in smritis.
The Dayabhaga and Mitakshara are the two major
schools of Hindu law. The Dayabhaga School of law is
   based on the commentaries of Jimutvahana (author of
   Dayabhaga which is the digest of all Codes) and the
   Mitakshara is based on the commentaries written by
   Vijnaneswar on the Code of Yajnavalkya.
   The basic objective of these texts was to gather the
   scattered material available in preceeding texts and
   present a unified view for the benefit of the society.
   Thus, digests were very logical and to the point in
   their approach. Various digests have been composed
   from 700 to 1700 AD.
   (iv) Custom-
   Custom is a principle source and its position is next
   to the Shrutis and Smritis but usage of custom
   prevails over the Smritis. It is superior to written law.
   Custom is regarded as the third source of Hindu law.
   From the earliest period custom (‘achara’) is regarded
   as the highest ‘dharma’. As defined by the Judicial
   Committee custom signifies a rule which in a
   particular family or in a particular class or district has
   from long usage obtained the force of law.
   Most of the Hindu law is based on customs and
   practices followed by the people all across the
   country. Even smrutis have given importance to
   customs. They have held customs as transcendent
   law and have advised the Kings to give decisions
   based on customs after due religious consideration.
   Customs are of four types:
1.    Local Customs- These are the customs that are
   followed in a given geographical area. In the case of
   Subbane vs Nawab, Privy Council observed that a
   custom gets it force due to the fact that due to its
    observation for a long time in a locality, it has
    obtained the force of law.
2.     Family Customs- These are the customs that are
    followed by a family from a long time. These are
    applicable to families where ever they live. They can
    be more easily abandoned that other customs. In the
    case of Soorendranath vs Heeramonie and Bikal vs
    Manjura, Privy Council observed that customs
    followed by a family have long been recognized as
    Hindu law.
3.     Caste and Community Customs- These are the
    customs that are followed by a particular cast or
    community. It is binding on the members of that
    community or caste. By far, this is one of the most
    important source of laws. For example, most of the
    law in Punjab belongs to this type. Custom to marry
    brother's widow among certain community is also of
    this type.
4.     Guild Customs - These are the customs that are
    followed by traders.
    Requirements for a valid custom:
 1. Ancient Ideally, a custom is valid if it has been
    followed from hundreds of years. There is no
    definition of ancientness, however, 40yrs has been
    determined to be a ancient enough. A custom cannot
    come into existence by agreement. It has to be
    existing from long before. Thus, a new custom cannot
    be recognized. Therefore, a new form of Hindu
    marriage was not recognized in Tamil Nadu. In the
    case of Rajothi vs Selliah, a Self Respecter’s Cult
    started a movement under which traditional
   ceremonies were substituted with simple ceremonies
   for marriage that did not involve Shastric rites. HC
   held that in modern times, no one is free to create a
   law or custom, since that is a function of legislature.
2. Continuous: It is important that the custom is being
   followed continuously and has not been abandoned.
   Thus, a custom may be 400 yrs old but once
   abandoned, it cannot be revived.
3. Certain: The custom should be very clear in terms of
   what it entails. Any amount of vagueness will cause
   confusion and thus the custom will be invalid. The
   one alleging a custom must prove exactly what it is.
4. Reasonable: There must be some reasonableness and
   fairness in the custom. Though what is reasonable
   depends on the current time and social values.
5. Not against morality: It should not be morally wrong
   or repugnant. For example, a custom to marry one's
   granddaughter has been held invalid. In the case of
   Chitty vs. Chitty 1894, a custom that permits divorce
   by mutual consent and by payment of expenses of
   marriage by one party to another was held to be not
   immoral. In the case of Gopikrishna vs. Mst Jagoo
   1936 a custom that dissolves the marriage and
   permits a wife to remarry upon abandonment and
   desertion of husband was held to be not immoral.
6. Not against public policy: If a custom is against the
   general good of the society, it is held invalid. For
   example, adoption of girl child by nautch girls has
   been held invalid. In the case of Mathur vs Esa, a
   custom among dancing women permitting them to
  adopt one or more girls was held to be void because it
  was against public policy.
7. Not against any law: If a custom is against any
  statutory law, it is invalid. Codification of Hindu law
  has abrogated most of the customs except the ones
  that are expressly saved. In the case of Prakash vs
  Parmeshwari, it was held that law mean statutory law.
  Proof of Custom:
  The burden of proving a custom is on the person who
  alleges it. Usually, customs are proved by instances.
  In the case of Prakash vs Parmeshwari, it was held
  that one instance does not prove a custom. However,
  in the case of Ujagar vs Jeo, it was held that if a
  custom has been brought to notice of the court
  repeated, no further proof is required. Existence of a
  custom can also be proved through documentary
  evidence such as in Riwaz-i-am. Several treaties exist
  that detail customary laws of Punjab.
  Usage and Custom:
  The term custom and usage is commonly used in
  commercial law, but "custom" and "usage" can be
  distinguished. A usage is a repetition of acts whereas
  custom is the law or general rule that arises from such
  repetition.
  A usage may exist without a custom, but a custom
  cannot arise without a usage accompanying it or
  preceding it. Usage derives its authority from the
  assent of the parties to a transaction and is applicable
  only to consensual arrangements. Custom derives its
  authority from its adoption into the law and is binding
  regardless of any acts of assent by the parties. In
  modern law, however, the two principles are often
  merged into one by the courts.
  Hindu law has been greatly influenced by the British
  rule. While it might seem that the British brought with
  them the modern concepts of equity and justice, these
  concepts existed even in dharamashastras albeit in a
  different form. Narada and Katyayana have mentioned
  the importance of dharma (righteousness) in
  delivering justice. However, we did not have a practice
  of recording the cases and judgments delivered. So it
  was not possible to apply stare decisis. This process
  started from the British rule.
  The following are the modern sources of Hindu law:
1. Equity, Justice, and Good conscience: Equity means
  fairness in dealing. Modern judicial systems greatly
  rely on being impartial. True justice can only be
  delivered through equity and good conscience. In a
  situation where no rule is given, a sense of
  'reasonableness' must prevail.
  Occasionally it might happen that a dispute comes
  before a Court which cannot be settled by the
  application of any existing rule in any of the sources
  available. Such a situation may be rare but it is
  possible because not every kind of fact situation
  which arises can have a corresponding law governing
  it.
  The Courts cannot refuse to the settle the dispute in
  the absence of law and they are under an obligation to
  decide such a case also. For determining such cases,
  the Courts rely upon the basic values, norms and
  standards of fair play and propriety.
  In terminology, this is known as principles of justice,
  equity and good conscience. They may also be termed
  as Natural law. This principle in our country has
  enjoyed the status of a source of law since the 18th
  century when the British administration made it clear
  that in the absence of a rule, the above principle shall
  be applied.
  According to Gautama, in such situation, the decision
  should be given that is acceptable to at least ten
  people who are knowledgeable in shastras.
  Yagyavalkya has said that where ever there are
  conflicting rules, the decision must be based on
  'Nyaya'. This principle has been followed by the Privy
  Council while deciding cases.
2. Precedent: The doctrine of stare decisis started in
  India from the British rule. All cases are now recorded
  and new cases are decided based on existing case
  laws.
  After the establishment of British rule, the hierarchy of
  Courts was established. The doctrine of precedent
  based on the principle of treating like cases alike was
  established. Today, the judgment of SC is binding on
  all courts across India and the judgment of HC is
  binding on all courts in that state, except where they
  have been modified or altered by the Supreme Court
  whose decisions are binding on all the Courts except
  for itself.
3. Legislation: Legislations are Acts of Parliament
  which have been playing a profound role in the
  formation of Hindu law. After India achieved
independence, some important aspects of Hindu Law
have been codified.
Few examples of important Statutes are:
After codification, any point dealt with by the codified
law is final. The enactment overrides all prior law,
whether based on custom or otherwise unless an
express saving is provided for in the enactment itself.
In matters not specifically covered by the codified law,
the old textual law contains to have application.
In modern society, this is the only way to bring in new
laws. The parliament, in accordance with the needs
society, constitutes new laws. For example, a new way
of performing Hindu marriages in Tamil Nadu that got
rid of rituals and priests was rejected by the SC on the
basis that new customs cannot be invented. However,
TN later passed an act that recognized these
marriages.
Also, most of the Hindu laws have now been codified
as mentioned in the beginning.