And smote him there - Joab feared that, after having rendered such essential services to David, Abner would be made captain of the host: he therefore determined to prevent it by murdering the man, under pretense of avenging the death of his brother Asahel.

The murder, however, was one of the most unprovoked and wicked: and such was the power and influence of this nefarious general, that the king dared not to bring him to justice for his crime. In the same way he murdered Amasa, a little time afterwards. See 2 Samuel 20:10. Joab was a cool-blooded, finished murderer. "Treason and murder ever keep together, like two yoke-devils."

And when Abner was returned to Hebron,.... Alone, and not the twenty men with him; not to David's court, but just to the city, to the gate of it:

Joab took him aside in the gate: where he was waiting for him, and met him; this was a public place, where people were continually passing and repassing, and where courts of judicature used to be held; wherefore Abner might think himself safe here with Joab, and have no suspicion at all of his design, and shows how fearless Joab was of God or men:

to speak with him quietly; peaceably, in a friendly manner, as all his gestures towards him showed; so that Abner made no difficulty of turning aside with him, supposing he had something to communicate to him from the king, which he had forgot:

and smote him under the fifth rib, that he died; in the same place that Abner had smote his brother, of which see 2 Samuel 2:23; and this he did:

for the blood of Asahel his brother; for Abner's shedding his brother's blood; but this was not the only reason, and perhaps not the chief; but, as Josephus (h) observes, because he was fearful if Abner was received into the friendship of the king, he would be preferred unto him, and take his place as general of the army, as being an older and more experienced officer; so Procopius Gazaeus, and Theodoret.

(h) Antiqu. l. 7. c. 1. sect. 5.

When he came back, Joab "took him aside into the middle of the gate, to talk with him in the stillness," i.e., in private, and there thrust him through the body, so that he died "for the blood of Asahel his brother," i.e., for having put Asahel to death (2 Samuel 2:23).

And when Abner was returned to Hebron, Joab took him aside in the gate to speak with him quietly, and smote him there under the fifth rib, that he died, for the blood of Asahel his brother.

quietly: or, peaceably

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.