II Chronicles 18:3, 29-32

So Ahab king of Israel said to Jehoshaphat king of Judah, “Will you go with me against Ramoth Gilead?” And he answered him, “I am as you are, and my people as your people; we will be with you in the war.”

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. 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.” So it was, when the captains of the chariots saw Jehoshaphat, that they said, “It is the king of Israel!” Therefore they surrounded him to attack; but Jehoshaphat cried out, and the LORD helped him, and God diverted them from him. For so it was, when the captains of the chariots saw that it was not the king of Israel, that they turned back from pursuing him.