2 Kings 9 is a chapter that tells the story of the rise of Jehu, a commander of the army of Israel, to the throne of Israel. Jehu was anointed by the prophet Elisha to be the king of Israel, and he was given a mission to destroy the house of Ahab, the previous king of Israel. Jehu was successful in his mission, and he killed Ahab's sons, as well as the queen mother, Jezebel.
The chapter also tells of the death of Jehu's predecessor, Jehoram, who was killed by Jehu's men. This was a necessary step in order for Jehu to take the throne, as Jehoram was the son of Ahab and the rightful heir to the throne.
The chapter ends with Jehu's coronation as king of Israel. This was a significant event in the history of Israel, as it marked the end of the house of Ahab and the beginning of a new era in Israel.
Overall, 2 Kings 9 is an important chapter in the Bible, as it tells the story of the rise of Jehu to the throne of Israel and the end of the house of Ahab. It is a reminder of the power of God to bring about change in the world, and it serves as a reminder of the importance of obedience to God's commands.