2 Jehoram's brothers were Azariah, Jehiel, Zechariah, Azariahu, Michael, and Shephatiah - the sons of Jehoshaphat king of Judah. 3 Their father had lavished them with gifts - silver, gold, and other valuables, plus the fortress cities in Judah. But Jehoram was his firstborn son and he gave him the kingdom of Judah. 4 But when Jehoram had taken over his father's kingdom and had secured his position, he killed all his brothers along with some of the government officials.
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.