II Kings 10:10-17

Know now that nothing shall fall to the earth of the word of the LORD which the LORD spoke concerning the house of Ahab; for the LORD has done what He spoke by His servant Elijah.” So Jehu killed all who remained of the house of Ahab in Jezreel, and all his great men and his close acquaintances and his priests, until he left him none remaining. And he arose and departed and went to Samaria. On the way, at Beth Eked of the Shepherds, Jehu met with the brothers of Ahaziah king of Judah, and said, “Who are you?” So they answered, “We are the brothers of Ahaziah; we have come down to greet the sons of the king and the sons of the queen mother.” And he said, “Take them alive!” So they took them alive, and killed them at the well of Beth Eked, forty-two men; and he left none of them. Now 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 right, as my heart is toward your heart?” And Jehonadab answered, “It is.” Jehu said, “If it is, give me your hand.” So he gave him his hand, and he took him up to him into the chariot. Then he said, “Come with me, and see my zeal for the LORD.” So they had him ride in his chariot. And when he came to Samaria, he killed all who remained to Ahab in Samaria, till he had destroyed them, according to the word of the LORD which He spoke to Elijah.