Facts necessary to explain or introduce a fact in issue or relevant fact, or which support or rebut an inference suggested by a fact in issue or relevant fact, or which establish the identity of any thing or person whose identity is relevant, or fix the time or place at which any fact in issue or relevant fact happened, or which show the relation of parties by whom any such fact was transacted, are relevant in so far as they are necessary for that purpose.

Illustrations

(a) The question is, whether a given document is the will of A.

(b) A sues B for a libel imputing disgraceful conduct to A; B affirms that the matter alleged to be libelous is true.

(c) A is accused of a crime.

(d) A sues B for inducing C to break a contract of service made by him with A. C, on leaving A's service, says to A - "I am leaving you because B has made me a better offer ". This statement is a relevant fact as explanatory of C's conduct, which is relevant as a fact in issue.

(e) A, accused of theft, is seen to give the stolen property to B, who is seen to give it to A's wife. B says as he delivers it - "A says you are to hide this ". B's statement is relevant as explanatory of a fact which is part of the transaction.

(f) A is tried for a riot and is proved to have marched at the head of a mob. The cries of the mob are relevant as explanatory of the nature of the transaction.