2 Kings 10:11-14

11So Jehu killed all who remained of the house of Ahab in Jezreel, and all his great men and his familiar friends and his priests, until he left him without a survivor.

12And he set out and went to Samaria. On the way as he was at the place of the sand heaps [meeting place] for the shepherds,

13Jehu met the relatives of Ahaziah king of Judah and said, “Who are you?” They answered, “We are the relatives of Ahaziah; and we came down to greet the royal princes and the sons of the queen mother [Jezebel].”

14Then Jehu said, “Take them alive.” So they took them alive and [later] slaughtered them at the well by the place of the sand heaps, forty-two men; he left none of them [alive].