Deuteronomy 19:20 WEB

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

¹⁹  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  Those who remain shall hear, and fear, and shall henceforth commit no more any such evil in the midst of you.

²¹  Your eyes shall not pity; life [shall go] for life, eye for eye, tooth for tooth, hand for hand, foot for foot.