1 Kings 20:38-41

Then the prophet went and stood by the road waiting for the king. He disguised himself with his headband down over his eyes. As the king passed by, the prophet called out to him, “Your servant went into the thick of the battle, and someone came to me with a captive and said, ‘Guard this man. If he is missing, it will be your life for his life, or you must pay a talent of silver.’ While your servant was busy here and there, the man disappeared.” “That is your sentence,” the king of Israel said. “You have pronounced it yourself.” Then the prophet quickly removed the headband from his eyes, and the king of Israel recognized him as one of the prophets.