In all civil actions brought by either the husband or wife, either the husband or the wife shall be a competent witness in rebuttal, when his or her character or conduct is attacked upon the trial thereof, but only in regard to the matter of his or her character or conduct.
42 Pa.C.S. § 5926
Testimony by spouse after attack on character or conduct
Known as the Judicial Code
The act spans §§ 42-101 to 42-9914 (972 sections).
Official source: Pennsylvania General Assembly. Reproduced from public-domain Pennsylvania statutes; confirm against the official source for the current text. Not legal advice.