33 Then the king sang this funeral song for Abner: "Should Abner have died as fools die? 34 Your hands were not bound; your feet were not chained. No, you were murdered- the victim of a wicked plot." All the people wept again for Abner. 35 David had refused to eat anything on the day of the funeral, and now everyone begged him to eat. But David had made a vow, saying, "May God strike me and even kill me if I eat anything before sundown." 36 This pleased the people very much. In fact, everything the king did pleased them! 37 So everyone in Judah and all Israel understood that David was not responsible for Abner's murder. 38 Then King David said to his officials, "Don't you realize that a great commander has fallen today in Israel?
Matthew Henry's Commentary on 2 Samuel 3:33-38
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.