2 Kings 10:10-14

Know, then, that not a word the LORD has spoken against the house of Ahab will fail. The LORD has done what he announced through his servant Elijah.” So Jehu killed everyone in Jezreel who remained of the house of Ahab, as well as all his chief men, his close friends and his priests, leaving him no survivor. Jehu then set out and went toward Samaria. At Beth Eked of the Shepherds, he met some relatives of Ahaziah king of Judah and asked, “Who are you?” They said, “We are relatives of Ahaziah, and we have come down to greet the families of the king and of the queen mother.” “Take them alive!” he ordered. So they took them alive and slaughtered them by the well of Beth Eked—forty-two of them. He left no survivor.