25 Is it not clear to you that Abner, the son of Ner, came with deceit to get knowledge of your going out and your coming in and of all you are doing? 26 And when Joab had come out from David, he sent men after Abner, and they overtook him at the water-spring of Sirah, and made him come back with them: but David had no knowledge of it. 27 And when Abner was back in Hebron, Joab took him on one side by the doorway of the town to have a word with him quietly, and there he gave him a wound in the stomach, causing his death in payment for the death of his brother Asahel. 28 And when David had word of it he said, May I and my kingdom be clear for ever in the eyes of the Lord from the blood of Abner, the son of Ner: 29 May it come on the head of Joab and all his father's family: among the men of Joab's family may there ever be some who are diseased or lepers, or who do the work of women, or are put to the sword, or are wasted from need of food! 30 So Joab and Abishai his brother put Abner to death, because he had put to death their brother Asahel in the fight at Gibeon. 31 And David said to Joab and all the people who were with him, Go in grief and put haircloth about you, in sorrow for Abner. And King David went after the dead body. 32 And they put Abner's body to rest in Hebron; and the king and all the people were weeping loudly by the resting-place of Abner's body. 33 And the king made a song of grief for Abner and said, Was the death of Abner to be like the death of a foolish man? 34 Your hands were free, your feet were not chained: like the downfall of a man before evil men, so was your fall. And the weeping of the people over him went on again. 35 And the people came to make David take food, while it was still day, but David with an oath said, May God's punishment be on me if I take a taste of bread or any other thing till the sun has gone down!
Matthew Henry's Commentary on 2 Samuel 3:25-35
Commentary on 2 Samuel 3:22-39
(Read 2 Samuel 3:22-39)
Judgments are prepared for such scorners as Abner; but Joab, in what he did, acted wickedly. David laid Abner's murder deeply to heart, and in many ways expressed his detestation of it. The guilt of blood brings a curse upon families: if men do not avenge it, God will. It is a sad thing to die like a fool, as they do that any way shorten their own days, and those who make no provision for another world. Who would be fond of power, when a man may have the name of it, and must be accountable for it, yet is hampered in the use of it? David ought to have done his duty, and then trusted God with the issue. Carnal policy spared Joab. The Son of David may long delay, but never fails to punish impenitent sinners. He who now reigns upon the throne of David, has a kingdom of a nobler kind. Whatever He doeth, is noticed by all his willing people, and is pleasing to them.