“Thus Jehu wiped out Baal from Israel” (v28). The prophets Elijah and Elisha had fought hard against the idolatrous worship of Baal; however, King Ahab and Jezebel had built altars to Baal and supported the cult’s priests. Baal worship – which included ritual sexual promiscuity and even child sacrifice – had spread throughout Israel. Jehu executed the priests, “demolished the pillar of Baal, and demolished the house of Baal, and made it a latrine to this day” (v27).
“See my zeal for the Lord” (v16). God hates idolatry because when we worship anything but Him, it destroys us. He wants the total loyalty of our hearts.