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.Joab saw that if Abner was reconciled to David, his own post as second in the state would be forfeited; and then with characteristic unscrupulosity he proceeded to take Abner's life. 24-27. Joab came to the king, and said, What hast thou done?—Joab's knowledge of Abner's wily character might have led him to doubt the sincerity of that person's proposals and to disapprove the policy of relying on his fidelity. But undoubtedly there were other reasons of a private and personal nature which made Joab displeased and alarmed by the reception given to Abner. The military talents of that general, his popularity with the army, his influence throughout the nation, rendered him a formidable rival. In the event of his overtures being carried out, the important service of bringing over all the other tribes to the king of Judah would establish so strong a claim on the gratitude of David, that his accession would inevitably raise a serious obstacle to the ambition of Joab. To these considerations was added the remembrance of the blood feud that existed between them since the death of his brother Asahel (2Sa 2:23). Determined, therefore, to get Abner out of the way, Joab feigned some reason, probably in the king's name, for recalling him, and, going out to meet him, stabbed him unawares; not within Hebron, for it was a city of refuge, but at a noted well in the neighborhood. To search out thy counsels and secret designs, and to make use of them against thee.

Thou knowest Abner the son of Ner,.... Thou canst not be ignorant what a cunning deceitful man he is, nor of his designs; or dost thou not know? art thou ignorant? so read the Septuagint, Vulgate Latin, Syriac, and Arabic versions, with an interrogation:

that he came to deceive thee: with false hopes, or to lead into wrong measures with an intention to involve and ruin him:

and to know thy going out, and coming in; the affairs of his court, the secrets of his government, to observe his conduct and behaviour, and all his actions, and improve them against him:

and to know all that thou doest; he suggests that he came not as a friend, but as a spy, and therefore ought to have been taken up, and detained, and not dismissed. This Joab said to set David against him, fearing, if he should be received into favour, he would be a rival of his; and besides his breast was full of revenge against him for the death of his brother.

Thou knowest Abner the son of Ner, that he came to deceive thee, and to know thy going out and thy coming in, and to know all that thou doest.