2 He had brothers, the sons of Jehoshaphat: Azariah, Jehiel, Zechariah, Azaryahu, Michael, and Shephatiah; all these were the sons of Jehoshaphat king of Israel. 3 Their father gave them great gifts of silver and gold and precious things, with fortified cities in Judah; but he gave the kingdom to Jehoram, because he was the firstborn. 4 Now when Jehoram was established over the kingdom of his father, he strengthened himself and killed all his brothers with the sword, and also others of the princes of Israel.
Matthew Henry's Commentary on 2 Chronicles 21:2-4
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.