Deuteronomy 19
15 Ref One witness shall not rise up against a man for any iniquity, or for any sin, in any sin that he sins: at the mouth of two witnesses, or at the mouth of three witnesses, shall a matter be established.
16 Ref If an unrighteous witness rise up against any man to testify against him of wrong-doing,
17 Ref then both the men, between whom the controversy is, shall stand before Yahweh, before the priests and the judges who shall be in those days;
18 Ref and the judges shall make diligent inquisition: and, behold, if the witness is a false witness, and has testified falsely against his brother;
19 Ref then shall you do to him, as he had thought to do to his brother: so shall you put away the evil from the midst of you.