Indian Evidence Act, 1872
160. Testimony to facts stated in document mentioned in section 159
A witness may also testify to facts mentioned in any such document as is mentioned is section 159, although he has no specific recollection of the facts themselves, if he is sure that the facts were correctly recorded in the document.
A book- keeper may testify to facts recorded by him in books regularly kept in the course of business, if he know that the books were correctly kept, although he has forgotten the particular transactions entered.