No one alleging his own wrongdoing is to be heard as a witness.

Explanation

A person who would profit from his own wrong is not a credible witness; the law does not receive testimony grounded in the witness's own turpitude.

Where this applies

• Someone who committed fraud is now trying to testify about it to benefit themselves.
• A party wants to use their own wrongdoing as leverage to win the case.
• The person testifying would directly profit from the court believing their story about their own misconduct.

See also

• 9.1.5 No one ought to be a witness in his own cause.
• 9.5.4 He who does not freely speak the truth is a betrayer of the truth.