Except, as the Lord hath sworn to David - And why did he not do this before, when he knew that God had given the kingdom to David? Was he not now, according to his own concession, fighting against God?

So do God to Abner, and more also,.... He wishes the worst of evils to himself, such as he cared not to name; but left them to be supposed what he meant as utter ruin and destruction of himself, soul and body:

except as the Lord hath sworn to David, even so I do to him; meaning if he did not do that David, which God had sworn should be done, namely, what follows, the translation of the kingdom to him; by which it appears that Abner knew of the promise and oath of God respecting this matter; and therefore acted against his conscience, in setting up Ishbosheth on the throne; which he knew would not prosper, and that he was fighting against God; which shows what a hardened wicked creature he was, and how far ambition, and being thought to be of consequence, will carry a man.

"God do so to Abner, ... as Jehovah hath sworn to David, so will I do to him." The repetition of כּי serves to introduce the oath, as in 2 Samuel 2:27. "To take away the kingdom from the house of Saul, and set up the throne of David over Israel and over Judah, from Dan to Beersheba." We do not know of any oath with which God had promised the kingdom to David; but the promise of God in itself is equivalent to an oath, as God is the true God, who can neither lie nor deceive (1 Samuel 15:29; Numbers 23:19). This promise was generally known in Israel. "From Dan to Beersheba" (as in Judges 20:1).

{e} So do God to Abner, and more also, except, as the LORD hath sworn to David, even so I do to him;

(e) We see how the wicked cannot abide being admonished about their faults, but seek their displeasure, who go about to bring them from their wickedness.

3:7-21 Many, like Abner, are not above committing base crimes, who are too proud to bear reproof, or even the suspicion of being guilty. While men go on in sin, and apparently without concern, they are often conscious that they are fighting against God. Many mean to serve their own purposes; and will betray those who trust them, when they can get any advantage. Yet the Lord serves his own designs, even by those who are thus actuated by revenge, ambition, or lust; but as they intend not to honour him, in the end they will be thrown aside with contempt. There was real generosity both to Michal and to the memory of Saul, in David's receiving the former, remembering probably how once he owed his life to her affection, and knowing that she was separated from him partly by her father's authority. Let no man set his heart on that which he is not entitled to. If any disagreement has separated husband and wife, as they expect the blessing of God, let them be reconciled, and live together in love.