God loves His people. He expects leaders that He appoint over His people to love them as well. This didn't happen in the case of King Ahab and his wife Jezebel. Not only did they not love and care for the house of Israel; they oppressed, abused, murdered, and led them astray to idol worship.
God sent a prophecy through Elisha to anoint Jehu as king. Following the specific instruction of God can change the course of lives, kingdoms, and destiny.