John Gill's Bible Commentary Ver. 9. So do God to Abner, and more also , etc.] 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.
Matthew Henry Commentary
Verses 7-21 - Many, like Abner, are not above committing base crimes, who are to proud to bear reproof, or even the suspicion of being guilty. While me go on in sin, and apparently without concern, they are often consciou that they are fighting against God. Many mean to serve their ow purposes; and will betray those who trust them, when they can get an advantage. Yet the Lord serves his own designs, even by those who ar 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. Ther 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 his partly by her father's authority. Let no man set his heart on tha which he is not entitled to. If any disagreement has separated husban and wife, as they expect the blessing of God, let them be reconciled and live together in love.
Original Hebrew כה3541 יעשׂה6213 אלהים430 לאבנר74 וכה3541 יסיף3254 לו כי3588 כאשׁר834 נשׁבע7650 יהוה3068 לדוד1732 כי3588 כן3651 אעשׂה׃6213