8 In his days Edom revolted from under the hand of Judah, and they set a king over themselves. 9 And Jehoram went over with his captains, 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. 10 But the Edomites revolted from under the hand of Judah unto this day. Then Libnah revolted at the same time from under his hand, because he had forsaken Jehovah the God of his fathers. 11 Moreover he made high places on the mountains of Judah, and caused the inhabitants of Jerusalem to commit fornication, and compelled Judah [thereto].

12 And there came a writing to him from Elijah the prophet saying, Thus saith Jehovah, the God of David thy father: Because thou hast not walked in the ways of Jehoshaphat thy father, nor in the ways of Asa king of Judah, 13 but hast walked in the way of the kings of Israel, and hast made Judah and the inhabitants of Jerusalem to commit fornication, like the fornications of the house of Ahab, and also hast slain thy brethren, thy father's house who were better than thyself: 14 behold, Jehovah will smite with a great stroke thy people, and thy children, and thy wives, and all thy substance, 15 and thyself with sore sicknesses, with a disease of thy bowels, until thy bowels fall out by reason of the sickness day by day. 16 And Jehovah stirred up against Jehoram the spirit of the Philistines, and of the Arabians, who [are] near the Ethiopians; 17 and they came up into Judah, and broke into it, and carried away all the substance that was found in the king's house, and his sons also, and his wives; so that there was no son left him, except Jehoahaz the youngest of his sons.

Matthew Henry's Commentary on 2 Chronicles 21:8-17

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.

Commentary on 2 Chronicles 21:12-20

(Read 2 Chronicles 21:12-20)

A warning from God was sent to Jehoram. The Spirit of prophecy might direct Elijah to prepare this writing in the foresight of Jehoram's crimes. He is plainly told that his sin should certainly ruin him. But no marvel that sinners are not frightened from sin, and to repentance, by the threatenings of misery in another world, when the certainty of misery in this world, the sinking of their estates, and the ruin of their health, will not restrain them from vicious courses. See Jehoram here stripped of all his comforts. Thus God plainly showed that the controversy was with him, and his house. He had slain all his brethren to strengthen himself; now, all his sons are slain but one. David's house must not be wholly destroyed, like those of Israel's kings, because a blessing was in it; that of the Messiah. Good men may be afflicted with diseases; but to them they are fatherly chastisements, and by the support of Divine consolations the soul may dwell at ease, even when the body lies in pain. To be sick and poor, sick and solitary, but especially to be sick and in sin, sick and under the curse of God, sick and without grace to bear it, is a most deplorable case. Wickedness and profaneness make men despicable, even in the eyes of those who have but little religion.