5 Jehoram was thirty-two years old when he became king; and he was ruling in Jerusalem for eight years. 6 He went in the ways of the kings of Israel, and did as the family of Ahab did, for the daughter of Ahab was his wife; and he did evil in the eyes of the Lord. 7 But it was not the Lord's purpose to send destruction on the family of David, because of the agreement he had made with David, when he said he would give to him and to his sons a light for ever.

Matthew Henry's Commentary on 2 Chronicles 21:5-7

Commentary on 2 Chronicles 21:1-11

(Read 2 Chronicles 21:1-11)

Jehoram hated his brethren, and slew them, for the same reason that Cain hated Abel, and slew him, because their piety condemned his impiety. In the mystery of Providence such men sometimes prosper for a time; but the Lord has righteous purposes in permitting such events, part of which may now be made out, and the rest will be seen hereafter.