1 Kings 20:41

And he hasted, and took the ashes away from his face Threw off his disguise immediately, by pulling off the cloth or bandage wherewith his face, or a part of it, had been concealed. And the king of Israel discerned him Either by his face, which was known to the king, or to some of the courtiers there present: or, by the manner of his address to him, which, being changed, was now such as the prophets generally used.