2 And he had brothers, sons of Jehoshaphat, Azariah, Jehiel, Zechariah, Azariah, Michael, and Shephatiah; all these were sons of Jehoshaphat, king of Israel. 3 And their father gave them much silver and gold and things of great value, as well as walled towns in Judah; but the kingdom he gave to Jehoram, because he was the oldest. 4 Now when Jehoram had taken his place over his father's kingdom, and had made his position safe, he put all his brothers to death with the sword, as well as some 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.