2 Kings 10:15-17

15When Jehu left Beth Eked, he met Rekab's son Jehonadab. He was coming to meet Jehu. Jehu said, ‘Hello! Do you trust me, as I trust you?’ Jehonadab answered, ‘Yes, I do!’ Jehu replied, ‘Then hold your hand out to me.’ So he did that and Jehu pulled him up into his chariot.

16Jehu said, ‘Come with me. You will see that I want to serve the Lord faithfully.’ So Jehonadab rode with Jehu in his chariot.

17Jehu arrived in Samaria. He killed all the descendants of Ahab who were still alive in Samaria. The Lord had told Elijah that this would happen.