6 As the war between the house of Saul and the house of David went on, Abner became a powerful leader among those loyal to Saul.
7 One day Ishbosheth, Saul's son, accused Abner of sleeping with one of his father's concubines, a woman named Rizpah, daughter of Aiah. 8 Abner was furious. "Am I some Judean dog to be kicked around like this?" he shouted. "After all I have done for your father, Saul, and his family and friends by not handing you over to David, is this my reward-that you find fault with me about this woman? 9 May God strike me and even kill me if I don't do everything I can to help David get what the Lord has promised him! 10 I'm going to take Saul's kingdom and give it to David. I will establish the throne of David over Israel as well as Judah, all the way from Dan in the north to Beersheba in the south." 11 Ishbosheth didn't dare say another word because he was afraid of what Abner might do. 12 Then Abner sent messengers to David, saying, "Doesn't the entire land belong to you? Make a solemn pact with me, and I will help turn over all of Israel 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.