“When King Jehu left there, he met Jehonadab son of Rechab coming to meet him. He greeted him, and said to him. ‘Is your heart as true to mine as mine is to yours?’ Jehonadab answered. ‘It is.’ King Jehu said. ‘If it is, give me your hand.’ So he gave him his hand. King Jehu took him up with him into the chariot. He said. ‘Come with me. See my zeal for Yahweh.’ So he had him ride in his chariot. When he came to Samaria, he killed all who were left to King Ahab in Samaria, until he had wiped them out, according to the word of Yahweh that he spoke to Elijah.”
The killing spree continued. King Jehu met Jehonadab who was the son of Rechab. The Rechabites were a wandering Arab tribe. It is not clear why they get involved in this murdering spree. Anyway, Jehonadab agrees with King Jehu. They went into Samaria and tried to find any remaining members of the King Ahab family. When they did, they killed them all. Once again, this was in fulfillment of the prophecy to Elijah in 1 Kings, chapters 19 and 21. King Jehu was obsessed with making sure that Elijah’s prophecy would come true.