Jehu was anointed King in Israel by Elisha the prophet, by the command of God, to carry out the prophecy of God to Elijah the prophet in 1 Kings 21. This was concerning Ahab and his wife Jezebel. Ahab is one of the most wicked kings in the history of Israel, and his wife was responsible for having many of the prophets of the LORD killed. Jehu carried out God's orders, God said to Jehu, you did all that was in my heart to do concerning the house of Ahab, (so your sons will sit on the throne of Israel for 4 generations), but in all that you did to the house of Ahab, you did it to promote yourself and your own glory, rather than to honor Me. Jehu was all about himself and his zeal and his reputation. And worst of all, though he killed all the worshipers of Baal, he kept the golden calves that Jeroboam the son of Nebat had made, and he even perpetuated idolatry in Israel.