2 Kings 10:10-14

Know then that there shall fall to the earth nothing of the word of the LORD, which the LORD spoke concerning the house of Ahab, 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 and his acquaintances and his priests, until he left him without a survivor. Then he arose and departed and went to Samaria. On the way while he was at Beth-eked of the shepherds, Jehu met the relatives of Ahaziah king of Judah and said, “Who are you?” And they answered, “We are the relatives of Ahaziah; and we have come down to greet the sons of the king and the sons of the queen mother.” He said, “Take them alive.” So they took them alive and killed them at the pit of Beth-eked, forty-two men; and he left none of them.