2 Kings 10:7-11

When the letter came to them, they took the king’s sons and slaughtered them, seventy men, and put their heads in baskets, and sent them to him at Jezreel.

When the messenger came and informed him, saying, “They have brought the heads of the king’s sons,” he said, “Put them in two heaps at the entrance of the gate until morning.”

Now in the morning he went out and stood and said to all the people, “You are innocent; behold, I conspired against my master and killed him, but who killed all these?

Know then that nothing of the word of the Lord, which the Lord spoke concerning the house of Ahab, shall fall to the earth, for the Lord has done what He spoke through His servant Elijah.”

So Jehu killed all who remained of the house of Ahab in Jezreel, and all his great men, his acquaintances, and his priests, until he left him without a survivor.