1 Kings 22:27-30

27and thou shalt say, Thus says the king: Put this [man] in the prison, and feed him with bread of affliction and with water of affliction, until I come in peace.

28And Micah said, If thou return at all in peace, Jehovah has not spoken by me. And he said, Hearken, O peoples, all of you!

29And the king of Israel and Jehoshaphat the king of Judah went up to Ramoth-Gilead.

30And the king of Israel said to Jehoshaphat, I will disguise myself, and will enter into the battle; but put thou on thy robes. And the king of Israel disguised himself, and went into the battle.