Verse 4. - Slew all his brethren... and also of the princes of Israel. It may be, as suggested by the genius of the last clause of our yet. 13, that Jehoram's wicked heart prompted him the rather because his own works were evil and his brothers' righteous. He may have thought their practical witness against him, and that of the "princes" who shared their fate, would be growingly inconvenient, and would work in them a necessary disloyalty (Judges 9:1-5). On the ether showing, the "princes" now cut down may have shown partiality and affection to the six brothers, one or other of them.

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.Now when Jehoram was risen up to the kingdom of his father,.... Succeeded him in it, and reigned alone, for he had reigned with his father some years before his death; see Gill on 2 Kings 8:16,

he strengthened himself; in the kingdom, by some means or another closely attaching the greater part of the princes, and people of the land, unto him, when he thought himself well settled and established on the throne; though some understand it of making strong, or hardening his heart to do what is next mentioned:

and slew all his brethren with the sword; either to get their riches into his hands, or lest, being religious princes, they should oppose his restoring idolatry, and for that reason the people should depose him, and set up one of them; and therefore he dispatched them out of the way to secure himself, and carry his point:

and divers also of the princes of Israel; such who had removed out of the ten tribes, for the sake of religion, and therefore would never agree to the introduction of idolatry among them, for which reason Jehoram slew them; and perhaps they might express their disapprobation and abhorrence of his murder of his brethren.