6 Now while there was war between Saul's people and David's people, Abner was making himself strong among the supporters of Saul.
7 Now Saul had among his wives a woman named Rizpah, the daughter of Aiah: and Ish-bosheth said to Abner, Why have you taken my father's wife? 8 And Abner was very angry at the words of Ish-bosheth, and he said, Am I a dog's head of Judah? I am this day doing all in my power for the cause of your father Saul and for his brothers and his friends, and have not given you up into the hands of David, and now you say I have done wrong with a woman. 9 May God's punishment be on Abner, if I do not for David as the Lord in his oath has said, 10 And if I do not take away the kingdom from the family of Saul and make David ruler over Israel and Judah from Dan as far as Beer-sheba! 11 And so great was Ish-bosheth's fear of Abner that he was not able to say a word in answer. 12 And Abner sent men to David at Hebron, saying, Make an agreement with me, and I will give you my support in getting all Israel on your side.
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.