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 they went into battle.
2 Chronicles 18:29
Surrounding context
18:28 So the king of Israel and Jehoshaphat the king of Judah went up to Ramoth Gilead.
18:29 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 they went into battle.
18:30 Now the king of Syria had commanded the captains of the chariots who were with him, saying, "Fight with no one small or great, but only with the king of Israel."