1 Kings 20:38

And the Prophet went forth and waited for the king by the way and altered his face with ashes.

1 Kings 14:2

And Jeroboam said unto his wife, "Up, a fellowship, and change thine apparel that thou be not known to be the wife of Jeroboam, and get thee to Shiloh. For there is Ahijah the prophet which told me that I should be king over this people.

2 Samuel 14:2

he sent to Tekoa, and fetched thence a wise woman, and said unto her, "Feign thyself to be a mourner, and put on mourning apparel. And anoint not thyself with oil. But be as a woman that had long time mourned for the death of somebody.

1 Kings 22:30

And the king of Israel said to Jehoshaphat, "Change thee and get thee to war: but put on thine own apparel." And the king of Israel changed himself, and went to battle also.

Matthew 6:16

"Moreover, when ye fast, be not sad as the hypocrites are: for they disfigure their faces, that they might be seen of men how they fast. Verily I say unto you, they have their reward.

Treasury of Scripture Knowledge

Summary

So the prophet departed, and waited for the king by the way, and disguised himself with ashes upon his face.

Bible References

Disguised

1 Kings 14:2
And Jeroboam said unto his wife, "Up, a fellowship, and change thine apparel that thou be not known to be the wife of Jeroboam, and get thee to Shiloh. For there is Ahijah the prophet which told me that I should be king over this people.
1 Kings 22:30
And the king of Israel said to Jehoshaphat, "Change thee and get thee to war: but put on thine own apparel." And the king of Israel changed himself, and went to battle also.
2 Samuel 14:2
he sent to Tekoa, and fetched thence a wise woman, and said unto her, "Feign thyself to be a mourner, and put on mourning apparel. And anoint not thyself with oil. But be as a woman that had long time mourned for the death of somebody.
Matthew 6:16
"Moreover, when ye fast, be not sad as the hypocrites are: for they disfigure their faces, that they might be seen of men how they fast. Verily I say unto you, they have their reward.