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Three Cities of Refuge
15“One witness shall not rise against a man concerning any iniquity or any sin that he commits; by the mouth of two or three witnesses the matter shall be established. 16If a false witness rises against any man to testify against him of wrongdoing, 17then both men in the controversy shall stand before the Lord, before the priests and the judges who serve in those days. 18And the judges shall make careful inquiry, and indeed, if the witness is a false witness, who has testified falsely against his brother, 19then you shall do to him as he thought to have done to his brother; so you shall put away the evil from among you. 20And those who remain shall hear and fear, and hereafter they shall not again commit such evil among you. 21Your eye shall not pity: life shall be for life, eye for eye, tooth for tooth, hand for hand, foot for foot.
Deuteronomy 19:15-21 (NKJV)