2 Chronicles 18:3, 29-32

Ahab king of Israel asked Jehoshaphat king of Judah, “Will you go with me to attack Ramoth in Gilead?” Jehoshaphat answered, “I will go with you, and my soldiers are yours. We will join you in the battle.”

King Ahab said to Jehoshaphat, “I will go into battle, but I will wear other clothes so no one will recognize me. But you wear your royal clothes.” So Ahab wore other clothes, and they went into battle. The king of Aram ordered his chariot commanders, “Don’t fight with anyone—important or unimportant—except the king of Israel.” When these commanders saw Jehoshaphat, they thought he was the king of Israel, so they turned to attack him. But Jehoshaphat began shouting, and the LORD helped him. God made the chariot commanders turn away from Jehoshaphat. When they saw he was not King Ahab, they stopped chasing him.