And Abner sent messengers to David on his behalf, saying, Whose is the land? saying also, Make thy league with me, and, behold, my hand shall be with thee, to bring about all Israel unto thee.

Wesley's Notes

3:12 Messengers - Who in his name might treat with David concerning his reconciliation with him. Thus God over - rules the passions of wicked men, to accomplish his own wise and holy purposes. And who then dare contend with that God who makes even his enemies to do his work, and destroy themselves? Whose, and c. - To whom doth this whole land belong, but to thee? Is it not thine by Divine right?

Jamieson-Fausset-Brown Bible Commentary

12, 13. Abner sent messengers to David-Though his language implied a secret conviction, that in supporting Ish-bosheth he had been laboring to frustrate the divine purpose of conferring the sovereignty of the kingdom on David, this acknowledgment was no justification either of the measure he was now adopting, or of the motives that prompted it. Nor does it seem possible to uphold the full integrity and honor of David's conduct in entertaining his secret overtures for undermining Ish-bosheth, except we take into account the divine promise of the kingdom, and his belief that the secession of Abner was a means designed by Providence for accomplishing it. The demand for the restoration of his wife Michal was perfectly fair; but David's insisting on it at that particular moment, as an indispensable condition of his entering into any treaty with Abner, seems to have proceeded not so much from a lingering attachment as from an expectation that his possession of her would incline some adherents of the house of Saul to be favorable to his cause.

Matthew Henry's Concise Commentary

3:7-21 Many, like Abner, are not above committing base crimes, who are too proud to bear reproof, or even the suspicion of being guilty. While men go on in sin, and apparently without concern, they are often conscious that they are fighting against God. Many mean to serve their own purposes; and will betray those who trust them, when they can get any advantage. Yet the Lord serves his own designs, even by those who are thus actuated by revenge, ambition, or lust; but as they intend not to honour him, in the end they will be thrown aside with contempt. There was real generosity both to Michal and to the memory of Saul, in David's receiving the former, remembering probably how once he owed his life to her affection, and knowing that she was separated from him partly by her father's authority. Let no man set his heart on that which he is not entitled to. If any disagreement has separated husband and wife, as they expect the blessing of God, let them be reconciled, and live together in love.