20 In his days hath Edom revolted from under the hand of Judah, and they cause a king to reign over them, 21 and Joram passeth over to Zair, and all the chariots with him, and he himself hath risen by night, and smiteth Edom, that is coming round about unto him, and the heads of the chariots, and the people fleeth to its tents; 22 and Edom revolteth from under the hand of Judah till this day; then doth Libnah revolt at that 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.