Section 133 BSA — Privilege not waived by volunteering evidence

The text

If any party to a suit gives evidence therein at his own instance or otherwise, he shall not be deemed to have consented thereby to such disclosure as is mentioned in section 132; and, if any party to a suit or proceeding calls any such advocate, as a witness, he shall be deemed to have consented to such disclosure only if he questions such advocate, on matters which, but for such question, he would not be at liberty to disclose.

Source: India Code (indiacode.gov.in). The Gazette of India is the authoritative text.