2 Chronicles 18:3, 29-32

Ahab king of Israel said to Jehoshaphat king of Judah, “Will you go with me to Ramoth-gilead?” He answered him, “I am as you are, 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 wear your robes.” And the king of Israel disguised himself, and they went into battle. Now the king of Syria had commanded the captains of his chariots, “Fight with neither small nor great, but only with the king of Israel.” As soon as the captains of the chariots saw Jehoshaphat, they said, “It is the king of Israel.” So they turned to fight against him. And Jehoshaphat cried out, and the LORD helped him; God drew them away from him. For as soon as the captains of the chariots saw that it was not the king of Israel, they turned back from pursuing him.