2 Kings 10:10-17

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. Now when he had departed from there, he met Jehonadab the son of Rechab coming to meet him; and he greeted him and said to him, “Is your heart right, as my heart is with your heart?” And Jehonadab answered, “It is.” Jehu said, “If it is, give me your hand.” And he gave him his hand, and he took him up to him into the chariot. He said, “Come with me and see my zeal for the LORD.” So he made him ride in his chariot. When he came to Samaria, he killed all who remained to Ahab in Samaria, until he had destroyed him, according to the word of the LORD which He spoke to Elijah.