Deuteronomy 19:16-18

16If a false witness rise up against any man to testify against him that which is wrong;1 17Then both the men, between whom the controversy is, shall stand before the Lord, before the priests and the judges, which shall be in those days; 18And the judges shall make diligent inquisition: and, behold, if the witness be a false witness, and hath testified falsely against his brother;