1 Kings 22:30 in the King James Version
And the king of Israel said unto Jehoshaphat, I will disguise myself, and enter into the battle; but put thou on thy robes. And the king of Israel disguised himself, and went into the battle.
Context
29 So the king of Israel and Jehoshaphat the king of Judah went up to Ramoth Gilead.
30 The king of Israel said to Jehoshaphat, “I will disguise myself and go into the battle, but you put on your robes.” The king of Israel disguised himself and went into the battle.
31 Now the king of Syria had commanded the thirty-two captains of his chariots, saying, “Don’t fight with small nor great, except only with the king of Israel.”