2 Kings 10:8-10

8And a messenger came and told him saying, They have brought the heads of the king's sons. And he said, Lay them in two heaps at the entrance of the gate until the morning.

9And it came to pass in the morning that he went out; and he stood, and said to all the people, Ye are righteous! behold, I conspired against my master and killed him; but who smote all these?

10Know now that nothing shall fall to the earth of the word of Jehovah, which Jehovah spoke concerning the house of Ahab; for Jehovah has done that which he said through his servant Elijah.