1 Kings 22:4

22:4 Then he said to Jehoshaphat, “Will you go with me to attack Ramoth Gilead?” Jehoshaphat replied to the king of Israel, “I will support you; my army and horses are at your disposal.”

1 Kings 22:30

22:30 The king of Israel said to Jehoshaphat, “I will disguise myself and then enter into the battle; but you wear your royal robes.” So the king of Israel disguised himself and then entered into the battle.