1 Kings 20:39-41

39And as the king passed by, he cried to the king and said, Thy servant went out into the midst of the battle; and behold, a man turned aside, and brought a man to me and said, Keep this man; if by any means he be missing, then shall thy life be for his life, or thou shalt pay a talent of silver.

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.