From Elijah — By this it appears, that Jehoram came to the throne before Elijah's translation. It is true, we find Elisha attending Jehoshaphat; but that might be, while Elijah was yet on earth: for we read of Jehoram's coming to the crown, before we read of Elijah's translation, 1 Kings 22:50. We may suppose, the time of his departure was at hand, so that he could not go in person to Jehoram. But he left this writing, probably with Elisha, to be sent the first opportunity. The message is sent in the name of the Lord God of David his father, upbraiding him with his relation to David, as that which was no more his honour, but an aggravation of his degeneracy.
Related Commentaries of 2 Chronicles 21:12
2 Chronicles 21:12
12 And there came a writing to him from Elijah the prophet, saying, Thus saith the LORD 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,