1 Kings 20:40 (KJV)

And a certain man of the sons of the prophets said unto his neighbour in the word of the LORD, Smite me, I pray thee. And the man refused to smite him.

Then said he unto him, Because thou hast not obeyed the voice of the LORD, behold, as soon as thou art departed from me, a lion shall slay thee. And as soon as he was departed from him, a lion found him, and slew him.

Then he found another man, and said, Smite me, I pray thee. And the man smote him, so that in smiting he wounded him.

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

And as the king passed by, he cried unto the king: and he said, Thy servant went out into the midst of the battle; and, behold, a man turned aside, and brought a man unto me, and said, Keep this man: if by any means he be missing, then shall thy life be for his life, or else thou shalt pay a talent of silver.

And he hasted, and took the ashes away from his face; and the king of Israel discerned him that he was of the prophets.

And he said unto him, Thus saith the LORD, Because thou hast let go out of thy hand a man whom I appointed to utter destruction, therefore thy life shall go for his life, and thy people for his people.

And the king of Israel went to his house heavy and displeased, and came to Samaria.