1 Kings 20:38-41

The prophet wrapped his face in a cloth so no one could tell who he was. Then he went and waited by the road for the king. As Ahab king of Israel passed by, the prophet called out to him. “I went to fight in the battle,” the prophet said. “One of our men brought an enemy soldier to me. Our man said, ‘Guard this man. If he runs away, you will have to give your life in his place. Or, you will have to pay a fine of seventy-five pounds of silver.’ But I was busy doing other things, so the man ran away.” The king of Israel answered, “You have already said what the punishment is. You must do what the man said.” Then the prophet quickly took the cloth from his face. When the king of Israel saw him, he knew he was one of the prophets.