Deuteronomy 19:20

¹⁸  And the judges shall make diligent inquisition: and, behold, if the witness be a false witness, and hath testified falsely against his brother;

¹⁹  Then shall ye do unto him, as he had thought to have done unto his brother: so shalt thou put the evil away from among you.

²⁰  And those which remain shall hear, and fear, and shall henceforth commit no more any such evil among you.

²¹  And thine eye shall not pity; but life shall go for life, eye for eye, tooth for tooth, hand for hand, foot for foot.