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.
20 Ref Those who remain shall hear, and fear, and shall henceforth commit no more any such evil in the midst of you.
21 Ref Your eyes shall not pity; life [shall go] for life, eye for eye, tooth for tooth, hand for hand, foot for foot.