If a document is required by law to be attested, it shall not be used as evidence until one attesting witness at least has been called for the purpose of proving its execution, if there be an attesting witness alive, and subject to the process of the Court and capable of giving evidence:
Provided that it shall not be necessary to call an attesting witness in proof of the execution of any document, not being a will, which has been registered in accordance with the provisions of the Indian Registration Act, 1908, unless its execution by the person by whom it purports to have been executed is specifically denied.
Legal Commentary & Landmark Judgments: Section 67
Section 67 establishes the strict statutory mandate for proving documents required by law to be attested, declaring that such documents shall not be used as evidence until at least one attesting witness has been called to prove execution.
In probate and succession litigation, the deposition of the attesting witness must strictly track the statutory formula: the witness must depose that the testator signed in the witness's presence, the testator was of sound disposing mind, and the witness signed in the testator's presence.