12 One day he got a letter from Elijah the prophet. It read, "From God, the God of your ancestor David - a message: Because you have not kept to the ways of Jehoshaphat your father and Asa your grandfather, kings of Judah, 13 but have taken up with the ways of the kings of Israel in the north, leading Judah and Jerusalem away from God, going step by step down the apostate path of Ahab and his crew - why, you even killed your own brothers, all of them better men than you! - 14 God is going to afflict your people, your wives, your sons, and everything you have with a terrible plague. 15 And you are going to come down with a terrible disease of the colon, painful and humiliating."
Matthew Henry's Commentary on 2 Chronicles 21:12-15
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.