And the king of Israel said to Jehoshaphat, "I will disguise myself and go into battle; but you put on your robes." So the king of Israel disguised himself and went into battle.
1 Kings 22:30
Surrounding context
22:29 So the king of Israel and Jehoshaphat the king of Judah went up to Ramoth Gilead.
22:30 And the king of Israel said to Jehoshaphat, "I will disguise myself and go into battle; but you put on your robes." So the king of Israel disguised himself and went into battle.
22:31 Now the king of Syria had commanded the thirty-two captains of his chariots, saying, "Fight with no one small or great, but only with the king of Israel."