Deuteronomy 17:6-8

Darby Translation

⁶ At the mouth of two witnesses, or three witnesses, shall he that is to die be put to death: he shall not be put to death at the mouth of one witness.

⁷ The hands of the witnesses shall be first upon him to put him to death, and afterwards the hands of all the people; and thou shalt put evil away from thy midst.

⁸ If there arise a matter too hard for thee in judgment, between blood and blood, between cause and cause, and between stroke and stroke, matters of controversy within thy gates, then shalt thou arise, and go up to the place which Jehovah thy God will choose.