2 Chronicles 18:3, 29-32

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

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 Aram had commanded the captains of his chariots, saying, “Do not fight with small or great, but with the king of Israel alone.” So when the captains of the chariots saw Jehoshaphat, they said, “It is the king of Israel,” and they turned aside to fight against him. But Jehoshaphat cried out, and the LORD helped him, and God diverted them from him. When the captains of the chariots saw that it was not the king of Israel, they turned back from pursuing him.