Deuteronomy 19:16-21 (New King James Version)

¹⁶ If a false witness rises against any man to testify against him of wrongdoing, ¹⁷ then both men in the controversy shall stand before the LORD, before the priests and the judges who serve in those days. ¹⁸ And the judges shall make careful inquiry, and indeed, if the witness is a false witness, who has testified falsely against his brother, ¹⁹ then you shall do to him as he thought to have done to his brother; so you shall put away the evil from among you. ²⁰ And those who remain shall hear and fear, and hereafter they shall not again commit such evil among you. ²¹ Your eye shall not pity: life shall be for life, eye for eye, tooth for tooth, hand for hand, foot for foot.