2 Kings 9:11
Then Jehu came forth to the servants of his lord: and one said unto him, Is all well? wherefore came this mad fellow to thee? And he said unto them, Ye know the man, and his communication. Then Jehu came forth to the servants of his lord: and one said unto him, Is all well? wherefore came this mad fellow to thee? And he said unto them, Ye know the man, and his communication.
2 Kings 9:1-13 recounts the anointing of Jehu and the announcement that he would become king over Israel, and the verse belongs to that account of his anointing and rise to power. Jehu was raised up to destroy the house of Ahab and to carry out God's judgment that extinguished it. That extinction included his killing of Joram and Ahaziah. The doom upon Ahab and Jezebel was brought by Jezebel's scheme to obtain Naboth's vineyard, and Ahab's taking possession of the vineyard sealed their fate.
That judgment executed fierce and summary destruction upon Baal worship, including the worshipers of Baal, and thus removed Baal worship from Israel. Ahab's worship of Baal had openly set aside Jehovah in violation of the first commandment by replacing Jehovah with Baal. By contrast, Jeroboam violated the second commandment by directing worship of the true God through images. After destroying Ahab's house, Jehu continued that sin of Jeroboam in using images to represent the true God.
Jehu might have redeemed Israel from false worship had he not been a worshiper of himself. The Assyrian record corroborates the biblical succession in which Jehu follows Ahab and later aids Hazael, though it incorrectly calls Jehu a son of Omri. Omri founded Ahab's dynasty but was not Jehu's father. The anointing account connects with the historical record naming Jehu as king of Israel and describing tribute he paid to Shalmaneser II.