Exclusion of Oral Evidence by Documentary Evidence: Sec 91 & 92 IEA/BSA

The Foundational Idea

There is a deeply practical wisdom in the maxim vox audita perit, litera scripta manet — the spoken word perishes, but the written word endures. When parties reduce their agreement to writing, either because the law compels them to do so or because they choose to do so of their own accord, the law insists that the writing alone shall speak for them. No oral testimony about what was said before or after the document was made will be permitted to override, modify, or contradict what the pen has recorded. This is the rule known in common law as the Parol Evidence Rule, and it finds its statutory home in India under Sections 91 and 92 of the Indian Evidence Act, 1872 — now carried forward, without substantive change, as Sections 94 and 95 of the Bharatiya Sakshya Adhiniyam, 2023 (BSA).

The Supreme Court stated the rationale with characteristic precision in Roop Kumar v. Mohan Thedani (AIR 2003 SC 2418). Writing furnishes a more reliable account than memory; it is the product of deliberation, not impulse; and when parties have so deliberately embedded their intention in written form, it would be mischievous to allow those careful arrangements to be overturned by collateral oral testimony — testimony that may be the product of treacherous memory, bad faith, or outright fabrication.

Section 91 / Section 94 BSA: The Best Evidence Rule in Documentary Form

Section 91 of the Evidence Act (Section 94 of the BSA) may be understood as the first limb of this two-part rule. It commands that when the terms of a contract, grant, or other disposition of property have been reduced to the form of a document — or when any matter is required by law to be reduced to the form of a document — then no evidence shall be given in proof of those terms except the document itself, or secondary evidence of its contents where secondary evidence is otherwise admissible.

This is not a preference for one kind of evidence over another. The Evidence Act does not generally declare documentary evidence to be superior to oral evidence; as was pointed out in Javarasetty v. Ningamma (AIR 1992 Kant 160), the Act does not lay down such a rule of preference. But Section 91 operates in a specific and limited domain: when a transaction has been put into writing, that writing becomes what is called the exclusive memorial of the transaction, and it cannot be displaced by oral testimony. The reason is that once parties have invested a writing with the weight of their agreement, they have ipso facto chosen to get rid of the uncertainty that oral evidence inherently carries.

The section covers two distinct situations. The first is where parties voluntarily reduce a transaction to writing — as where a contract of sale, a deed of mortgage, a lease agreement, or a deed of gift is written up though the law does not strictly demand it. The second is where the law itself mandates writing as a condition of legal efficacy. Under the Transfer of Property Act, 1882, a sale or exchange of immovable property worth Rs. 100 or more must be effected by a registered instrument. Similarly, a mortgage by deposit of title deeds for an amount exceeding Rs. 100 requires an attested and registered deed under Section 59 of that Act; a lease from year to year or for a term exceeding one year requires registration under Section 107; a gift of immovable property must be by a registered instrument under Section 123. When a confession is made by an accused before a Magistrate, it is required by law to be reduced to writing under Section 164 of the CrPC (now Section 405 of the BNSS). In all these cases and others like them, the document is not merely evidence of the transaction — it is the transaction. To prove the transaction by oral evidence is therefore impossible in principle, not merely inadmissible in procedural terms.

Section 92 / Section 95 BSA: Exclusion of Oral Agreement After Proof of Writing

Section 92 of the Evidence Act (Section 95 of the BSA) is the second limb, and it operates after the document has been proved. Once the document has been produced in evidence in accordance with Section 91, Section 92 erects a wall of exclusion: no evidence of any oral agreement or statement shall be admitted, as between the parties to the instrument or their representatives in interest, for the purpose of contradicting, varying, adding to, or subtracting from its terms.

In Bai Hira Devi v. The Official Assignee of Bombay (AIR 1958 SC 448), Justice Gajendragadkar articulated the relationship between the two sections with admirable clarity. Section 91 prohibits oral evidence to prove the contents of a written document. Section 92 goes further and prohibits oral evidence to vary or contradict those contents once proved. He observed: "Section 91 would be frustrated without the aid of Section 92, and Section 92 would be inoperative without the aid of Section 91." Together, they raise the writing to a position of conclusive memorial. All collateral oral testimony — whether discussions that preceded the signing, conversations during the execution, or representations made contemporaneously — is shut out.

The sections, however, are not identical in their sweep. Section 91 applies to all documents, whether dispositive or not, and whether bilateral or unilateral. A will is a unilateral document, and Section 91 requires that it be proved only by the document itself (or by probate under Exception 2). Section 92, by contrast, applies only to bilateral documents — contracts, grants, and other dispositions of property between two or more parties. It applies only between the parties to such an instrument and their representatives in interest, not to strangers or third parties. A stranger to the document — not bound by its terms — may prove a contemporaneous oral agreement that varies its terms, and this is what Section 99 of the Evidence Act (Section 103 of the BSA) expressly permits.

The Illustrations Speak Plainly

Illustration (a) to Section 92 (now Section 95 BSA) is instructive. A policy of insurance is taken out on goods in ships sailing from Calcutta to London. The goods are shipped on a particular vessel, which is lost. The fact that that particular ship was orally excepted from the policy — that is, orally agreed to be excluded — cannot be proved. The policy is the document; what is not in the policy cannot be brought in through the back door of oral testimony.

Illustration (b) is equally clear: A agrees absolutely in writing to pay B Rs. 1,000 on the first of March. The fact that, at the time the writing was made, there was a contemporaneous oral agreement that the money would not be paid until the thirty-first of March cannot be proved. The written document says the first; it is the first, regardless of what may have been said orally.

But Illustration (g) reveals an important limit to the rule. A sells B a horse and verbally warrants the horse to be sound. A gives B a slip of paper saying: "Bought of A a horse for Rs. 500." B may prove the verbal warranty. This is because the slip is not a formal contract embodying all terms of the sale; it is merely a receipt. The verbal warranty is a separate matter, not inconsistent with the slip, and may be proved under Proviso 2.

Scope of Section 91 / Section 94 BSA: What the Rule Does Not Cover

The rule of Section 91 operates only when the document appears to contain all the terms of the transaction. If parties intended to reduce into writing only part of their agreement, oral evidence of the remaining terms is not excluded. This distinction was settled in Jamna Doss v. Srinath Roy (1889 17 Cal 176), where it was held that if the parties intended to commit to writing a portion only of the terms, they may give oral evidence of the unwritten terms.

Three explanations to Section 91 help fine-tune its operation:

Explanation 1 makes clear that the section applies whether the contract, grant, or disposition is contained in one document or spread across multiple documents — as when parties negotiate by correspondence and a series of letters together constitutes a single contract. Illustration (a) to Section 91 says that if a contract is contained in several letters, all the letters must be proved.
Explanation 2 provides that where there are more originals than one, only one need be proved. A bill of exchange drawn in a set of three is itself a classic example.
Explanation 3 is of great practical importance: the bar of Section 91 is confined only to the proof of the terms of the contract, grant, or disposition, and it does not prevent the proof of any other fact by oral evidence merely because it happens to be mentioned in a document. Illustration (d) shows this beautifully: a contract for delivery of indigo mentions the fact that B had previously paid A for indigo contracted verbally on another occasion. Oral evidence to show that no such earlier payment was made is admissible — because that earlier payment is not a term of the present contract, merely an incidental recital. Illustration (e) is equally clear: a receipt given for money paid does not prevent oral proof of the fact of payment itself, because a receipt is not a dispositive document that embodies terms.

The Exceptions to Section 91

Section 91 carries two express exceptions:

Exception 1: When a public officer is required by law to be appointed in writing, and it is shown that a particular person has acted as such officer, the writing of appointment need not be proved. This is based on the maxim omnia praesumuntur rite esse acta — all things are presumed to have been done in due form. The fact that a person publicly acts as a government officer is itself prima facie proof that he was duly appointed.

Exception 2: Wills admitted to probate in India may be proved by the probate itself. Section 2(f) of the Indian Succession Act, 1925 defines probate as a copy of the will certified under the seal of the Court with a grant of administration. The probate, being a court-certified document, acts as conclusive evidence of the contents of the will against all parties interested under it.

The Six Provisos to Section 92 / Section 95 BSA

While Section 92 erects a strong barrier against oral evidence, the law acknowledges that there are situations where rigid adherence to the written word would produce injustice. It, therefore, provides six provisos, each recognizing a distinct category of case where oral evidence is admissible notwithstanding the existence of a written document.

Proviso 1 — Invalidity of the Document: Any fact may be proved which would invalidate the document or entitle any person to a decree relating to it — such as fraud, intimidation, illegality, want of due execution, want of capacity in a contracting party, want or failure of consideration, or mistake in fact or law. This proviso rests on a simple logic: Section 92 presupposes a valid, binding document. It has no application where the very existence, validity, or enforceability of the document is challenged. As the Privy Council held in Tyagaraja Mudaliyar v. Vedathanni (AIR 1936 PC 70), if the challenge is that no contract came into existence at all, Section 92 does not bar the way. Illustration (d) to the section demonstrates this: A enters into a written contract with B to work certain mines, but was induced to do so by B's misrepresentation as to the value of the mines. This fact — the misrepresentation — may be proved.

Proviso 2 — Silence in the Document: The existence of any separate oral agreement as to any matter on which the document is silent, and which is not inconsistent with its terms, may be proved. The key here is the double requirement: the document must be silent on the matter, and the oral agreement must not contradict any express term. Illustration (g) captures this: A sells B a horse and verbally warrants it to be sound. The receipt says "bought for Rs. 500." The warranty is about a matter the receipt is wholly silent on, and is consistent with the sale. It may be proved. However, the proviso contains a rider: in considering its application, the Court shall have regard to the degree of formality of the document. A formally drawn, stamp-paper agreement prepared by a lawyer and duly signed is presumed to embody all agreed terms — the more formal the document, the more reluctant the court will be to allow proof of unrecorded oral terms. This is illustrated in Illustration (h): A hires lodgings for a year, and a formally stamped agreement drawn up by an attorney is made; it is silent on the subject of board. A may not prove that board was verbally included. But when A hires lodgings and receives only a card saying "Rooms, Rs. 200 a month," he may prove that the terms verbally included partial board.

Proviso 3 — Condition Precedent: The existence of a separate oral agreement constituting a condition precedent to the attaching of any obligation under the document may be proved. This is a well-known common-law concept: if the very coming into force of the written contract was made conditional on some oral agreement — that is, the contract was not to bind until a certain thing happened — oral evidence of that condition may be given. The Supreme Court gave effect to this principle in Naraindas Gaziwala v. Papammal (AIR 1967 SC 333), where oral evidence was allowed to show that a promissory note was not to be enforced during the period of A's agency. Illustration (j) is the clearest example: A and B make a contract in writing, the writing being left with B, to take effect upon the happening of a certain contingency. A may show the circumstances under which it was delivered — i.e., that it was to take effect only if a specified event occurred.

Proviso 4 — Subsequent Oral Agreement to Rescind or Modify: Parties may prove the existence of a distinct subsequent oral agreement to rescind or modify their contract, except in cases where the contract is by law required to be in writing or has been registered. The proviso gives effect to the principle of novatio — a later agreement can supersede or modify an earlier one. However, once the document is registered or required by law to be in writing, the formality attaching to it prevents its undoing by a casual subsequent oral arrangement. The rationale is that what required formality to create requires equal formality to destroy. In S. Saktivel v. M. Venugopal Pillai (AIR 2000 SC 2633), the Supreme Court held that a party to a registered sale deed cannot prove a subsequent oral agreement modifying it.

Proviso 5 — Usage or Custom: Any usage or custom by which incidents not expressly mentioned in any contract are usually annexed to contracts of that description may be proved, provided the custom is not repugnant to or inconsistent with the express terms of the contract. This proviso recognizes the body of mercantile law known as lex mercatoria — the accumulated practices and usages of trade, which parties in a particular trade or community are presumed to have tacitly incorporated into their contracts. In Wigglesworth v. Dallison (1 Doug 201), the court allowed evidence of a custom by which the agricultural tenant was entitled at the end of his lease to take away the crop he had sown — a way-going crop — though the written lease made no mention of such a right. The court held that the custom "superadds a right which is consequential to the taking" and does not alter or contradict the lease.

Proviso 6 — Language Related to Existing Facts: Any fact may be proved which shows in what manner the language of a document is related to existing facts. This proviso, as the Privy Council held in Balkishen Das v. Legge (1899 27 IA 58 PC), is essentially a rule of construction rather than a rule of evidence in the strict sense. When the language of a document is not clear in itself, or when it does not fit accurately the facts to which it purports to apply, extrinsic evidence of the surrounding circumstances may be adduced to illuminate the connection between the words of the document and the world it describes. The proviso does not permit parties to override plain language — it only allows circumstances to be proved to see how the language maps onto reality. Acts and conduct of parties and evidence of their subjective intention are excluded; what is permitted is evidence of objective surrounding circumstances.

The Related Scheme: Patent and Latent Ambiguity

Sections 93 and 94 of the Evidence Act (Sections 96 and 97 of the BSA) address ambiguity in documents — situations where the language itself may mislead. Section 93/BSA Section 96 deals with patent ambiguity — ambiguity appearing on the face of the document. If a contract says "A agrees to sell a horse to B for Rs. 1,000 or Rs. 1,500," the document is ambiguous on its face and oral evidence cannot be given to show which price was meant. The law treats this as an incurable uncertainty. Similarly, if a deed contains blanks, oral evidence cannot supply them. The parties should have drafted their document with care; the Court will not, through oral evidence, write their contract for them.

Section 94/BSA Section 97, on the other hand, states the rule for cases where the language is plain in itself and applies accurately to existing facts: no evidence may be given to show it was not meant to apply to those facts. If A sells B "my estate at Rampur containing 100 bighas" and A has such an estate at Rampur with exactly 100 bighas, oral evidence to show it was a different estate of a different size is barred. The assumption is that the parties said precisely what they meant, and the Court's task is to give those words their natural meaning. Lord Denman CJ put it memorably in Rickman v. Carstairs (1833 5 B&Ad 651): "The question is not what was the intention of the parties, but what is the meaning of the words they have used."

Latent ambiguity — ambiguity that does not appear on the face of the document but emerges when the language is applied to the facts — is a different matter entirely. Sections 95 to 98 of the Evidence Act (Sections 98 to 102 of the BSA) govern this territory. Section 95 (BSA Section 98) permits oral evidence when the language, though plain in itself, is unmeaning in reference to existing facts. A classic illustration: A sells B "my house in Calcutta." A has no house in Calcutta but has one in Howrah, of which B has been in possession since the execution of the deed. Evidence may be given that the deed referred to the Howrah house — because when applied to facts, the language is unmeaning, and the latent ambiguity so created may be resolved by extrinsic evidence.

Section 96 (BSA Section 99) addresses equivocation — where the language of the document could apply to any one of several persons or things but can be meant to apply to only one. If A agrees to sell "my white horse" and has two white horses, oral evidence may be given to show which was meant. The Supreme Court approved this principle in Chunchun Jha v. Ebadat Ali (AIR 1954 SC 354): where there is ambiguity in the language employed, it is permissible to look to surrounding circumstances to determine what was intended.

Third Parties: Section 99 / Section 103 BSA

The bar of Section 92 applies only between the parties to the instrument and their representatives in interest. Third parties — strangers to the document — are entirely outside its reach. Section 99 of the Evidence Act (Section 103 of the BSA) expressly permits third parties to give evidence of any fact tending to show a contemporaneous agreement varying the terms of the document, if it affects their interests. This was confirmed in Bai Hira Devi v. The Official Assignee of Bombay (AIR 1958 SC 448), where the Official Assignee of an insolvent was held not to be a representative in interest of the insolvent, and could therefore lead oral evidence to vary the terms of a gift deed that the insolvent had executed in favour of the appellants. The doctrine of mutuality underlying Section 92 tied the parties to the instrument; it could not tie a public functionary acting in the interest of all creditors. The maxim pacta tertiis nec nocent, nec prosunt — agreements can neither impose duties nor confer rights on third parties — is the classical foundation for this position.

Wills and Section 100 / Section 104 BSA

Section 100 of the Evidence Act (Section 104 of the BSA) saves the provisions of the Indian Succession Act, 1925 relating to the construction of wills from the operation of Chapter VI. The rules of Chapter VI are general rules of evidence governing contracts and dispositions of property between living parties. Wills operate under a completely different scheme of construction set out in Chapter VI of the Indian Succession Act. This is because a will speaks only after the death of its author, who can never be examined to clarify his intention; the principles of construction developed for testamentary documents are necessarily different from those governing contracts between parties who are both alive and capable of giving evidence.

The Unifying Principle

Sections 91 and 92 of the Evidence Act — now Sections 94 and 95 of the BSA — together embody what Sir James Stephen called a principle of both substance and policy. It is a principle of substance because the written contract, by its very nature and origin, is entitled to a higher degree of credit than oral testimony. It is a principle of policy because if written instruments — upon which rights and obligations depend — were to be perpetually open to challenge by the loose, shifting testimony of memory and oral affirmation, no contract would ever be secure, no title ever settled, no transaction ever final. The law draws a firm line in the sand: what has been committed to writing is the definitive statement of the parties' intention, and the Court's task is to give effect to those written words — neither more nor less than what the writing itself says.