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 said by his servant Elijah.” So Jehu struck down all who remained of the house of Ahab in Jezreel, all his great men and his close friends and his priests, until he left him none remaining. Then he set out and went to Samaria. On the way, when he was at Beth-eked of the Shepherds, Jehu met the relatives of Ahaziah king of Judah, and he said, “Who are you?” And they answered, “We are the relatives of Ahaziah, and we came down to visit the royal princes and the sons of the queen mother.” He said, “Take them alive.” And they took them alive and slaughtered them at the pit of Beth-eked, forty-two persons, and he spared none of them. And when he 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 true to my heart as mine is to yours?” And Jehonadab answered, “It is.” Jehu said, “If it is, give me your hand.” So he gave him his hand. And Jehu took him up with him into the chariot. And he said, “Come with me, and see my zeal for the LORD.” So he had him ride in his chariot. And when he came to Samaria, he struck down all who remained to Ahab in Samaria, till he had wiped them out, according to the word of the LORD that he spoke to Elijah.