Deuteronomy 19:17-19

17the two people involved in the dispute must stand in the presence of the Lord before the priests and the judges who are in office at the time. 18The judges must make a thorough investigation, and if the witness proves to be a liar, giving false testimony against a fellow Israelite, 19then do to the false witness as that witness intended to do to the other party. You must purge the evil from among you.