20 In his days Edom revolted from under the hand of Judah, and they set a king over themselves. 21 And Joram went over to Zair, and all the chariots with him; and he rose up by night, and smote the Edomites who had surrounded him, and the captains of the chariots; and the people fled into their tents. 22 But the Edomites revolted from under the hand of Judah unto this day. Then Libnah revolted at the same time.
Matthew Henry's Commentary on 2 Kings 8:20-22
Commentary on 2 Kings 8:16-24
(Read 2 Kings 8:16-24)
A general idea is given of Jehoram's badness. His father, no doubt, had him taught the true knowledge of the Lord, but did ill to marry him to the daughter of Ahab; no good could come of union with an idolatrous family.