Deuteronomy 19:12-16

then the elders of his city shall send and fetch him thence, and deliver him into the hand of the avenger of blood, that he may die. Thine eye shall not pity him, but thou shalt put away the guilt of innocent blood from Israel, that it may go well with thee. Thou shalt not remove thy neighbour's landmark, which they of old time have set in thine inheritance, which thou shalt inherit in the land that the LORD thy God giveth thee to possess it. One witness shall not rise up against a man for any iniquity, or for any sin, in any sin that he sinneth: at the mouth of two witnesses, or at the mouth of three witnesses, shall the matter be established. If a false witness rise up against any man to testify against him that which is wrong