6 Abner took advantage of the continuing war between the house of Saul and the house of David to gain power for himself.
7 Saul had had a concubine, Rizpah, the daughter of Aiah. One day Ish-Bosheth confronted Abner: "What business do you have sleeping with my father's concubine?" 8 Abner lost his temper with Ish-Bosheth, "Treat me like a dog, will you! Is this the thanks I get for sticking by the house of your father, Saul, and all his family and friends? I personally saved you from certain capture by David, and you make an issue out of my going to bed with a woman! 9 What God promised David, I'll help accomplish - transfer the kingdom from the house of Saul and make David ruler over the whole country, both Israel and Judah, from Dan to Beersheba. If not, may God do his worst to me." 10 11 Ish-Bosheth, cowed by Abner's outburst, couldn't say another word. 12 Abner went ahead and sent personal messengers to David: "Make a deal with me and I'll help bring the whole country of Israel over to you."
Matthew Henry's Commentary on 2 Samuel 3:6-12
Commentary on 2 Samuel 3:1-6
(Read 2 Samuel 3:1-6)
The length of this war tried the faith and patience of David, and made his settlement at last the more welcome. The contest between grace and corruption in the hearts of believers, may fitly be compared to this warfare. There is a long war between them, the flesh lusting against the spirit, and the spirit against the flesh; but as the work of holiness is carried on, corruption, like the house of Saul, grows weaker and weaker; while grace, like the house of David, grows stronger and stronger.
Commentary on 2 Samuel 3:7-21
(Read 2 Samuel 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.