Deuteronomy 19:14-21

“You shall not move your neighbor’s boundary mark, which the forefathers [who first divided the territory] have set, in the land which you will inherit in the land which the LORD your God is giving you to possess. “A single witness shall not appear in a trial against a man for any wrong or any sin which he has committed; [only] on the testimony or evidence of two or three witnesses shall a charge be confirmed. If a malicious witness rises up against a man to [falsely] accuse him of wrongdoing, then both parties to the controversy shall stand before the LORD, before the priests and the judges who will be in office at that time. The judges shall investigate thoroughly, and if the witness is a false witness, and he has accused his brother falsely, then you shall do to him just as he had intended to do to his brother. So you shall remove the evil from among you. Those who remain will hear and be afraid, and will never again do such an evil thing among you. You shall not show pity [to the guilty one]: it shall be life for life, eye for eye, tooth for tooth, hand for hand, foot for foot.