'Witnesses' in the Bible

By the mouth of two witnesses or of three witnesses is he who is dead put to death; he is not put to death by the mouth of one witness;

the hand of the witnesses is on him, in the first place, to put him to death, and the hand of all the people last; and thou hast put away the evil thing out of thy midst.

'One witness doth not rise against a man for any iniquity, and for any sin, in any sin which he sinneth; by the mouth of two witnesses, or by the mouth of three witnesses, is a thing established.