Jehu and Jehonadab kill Ahab's Samaritan relatives
15 As Jehu was leaving, he saw Jehonadab coming to meet him.
Jehu saluted him, and said, “Is your heart true, as mine is with yours?”
Jehonadab said, “It is. Give me your hand.”
And Jehu gave him his hand and lifted him into his chariot.
16 Jehu said, “Come with me and see my zeal for the Lord.”
So Jehonadab rode off in Jehu's chariot.
17 When they arrived in Samaria, they killed all of Ahab's remaining family, according to God's words to Elijah.
Jehu kills the followers of Baal
18-19 Jehu gathered all the people and said to them,
Call all the prophets, servants, and priests of Baal, because I will have a great sacrifice to Baal. Any of Baal's followers that refuse to come will be killed.
(Jehu was lying so he could kill the worshipers of Baal.)
21 So the assembly for Baal was proclaimed. And all of Baal's followers came.
Since Jehu is such a mass murderer, it's hard to know who he is talking about here. But I suppose it was Jehoram (Joram) of Israel, who was the king of Israel when Jehu killed him.
God's going to have all of Ahab's family killed, like he said to Elijah. (10:10)
"Behold, I [God] will bring evil upon thee, and will take away thy posterity, and will cut off from Ahab him that pisseth against the wall." 1 Kings 21:21 (Episode 144)