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2 Samuel 3:21ESV·author unknown

And Abner said to David, “I will arise and go and will gather all Israel to my lord the king, that they may make a covenant with you, and that you may reign over all that your heart desires.” So David sent Abner away, and he went in peace.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. Abner breaks with Ish-bosheth, and deserts his interest, upon a little provocation which Ish-bosheth unadvisedly gave him. God can serve his own purposes by the sins and follies of men. 1. Ish-bosheth accused Abner of no less a crime than debauching one of his father's concubines, Sa2 3:7.

Commenting on 2 Samuel 3:7-21

John Gill Reformed Baptist @doctorgill

And Abner said to David, I will arise and go,.... Into the several parts of the land of Israel: and will gather all Israel unto my lord the king; the princes of the several tribes, and the elders of the people, their heads and principal men: that they may make a league with thee; come into the league and covenant now made with Abner, and...

Adam Clarke Methodist @methodicalclarke

He went in peace - David dismissed him in good faith, having no sinister design in reference to him.