2 Kings 10:15-19

Now when he had gone from there, he encountered Jehonadab the son of Rechab coming to meet him; and he greeted him and said to him, “Is your heart right, just as my heart is with your heart?” And Jehonadab answered, “It is.” Jehu said, “If it is, give me your hand.” And he gave him his hand, and he pulled him up to him into the chariot.

Then he said, “Come with me and see my zeal for the Lord.” So he had him ride in his chariot.

When he came to Samaria, he killed all who remained to Ahab in Samaria, until he had eliminated them, in accordance with the word of the Lord which He spoke to Elijah. Jehu Destroys Baal Worshipers

Then Jehu gathered all the people and said to them, “Ahab served Baal a little; Jehu will serve him much.

Now, summon to me all the prophets of Baal, all his worshipers and all his priests; let no one go missing, because I have a great sacrifice for Baal; whoever is missing shall not live.” But Jehu did it in deception, in order to eliminate the worshipers of Baal.