1 Kings 20:40-42

40And as thy servant was busy here and there, he was gone. And the king of Israel said to him, So [is] thy judgment: thyself hast decided [it].

41Then he hastily took the sash away from his face; and the king of Israel discerned him, that he was of the prophets.

42And he said to him, Thus saith Jehovah: Because thou hast let go out of thy hand the man that I had devoted to destruction, thy life shall be for his life, and thy people for his people.