Section 128 Indian Evidence Act 1872
Section 128 of the Indian Evidence Act 1872 is about ‘Privilege not waived by volunteering evidence’. It is under Chapter IX of the Act. Chapter IX is titled ‘OF WITNESSES‘.
Privilege not waived by volunteering evidence
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 126; and, if any party to a suit or proceeding calls any such barrister, [pleader], attorney or vakil as a witness, he shall be deemed to have consented to such disclosure only if he questions such barrister, attorney or vakil on matters which, but for such question, he would not be at liberty to disclose.
See also:
Section 127 Indian Evidence Act 1872 (Section 126 to apply to interpreters, etc.)