1 Kings 20:13, 38

And, behold, a prophet came near unto Ahab king of Israel, and said, Thus saith Jehovah, Hast thou seen all this great multitude? behold, I will deliver it into thy hand this day; and thou shalt know that I am Jehovah.

So the prophet departed, and waited for the king by the way, and disguised himself with his headband over his eyes.