2 Samuel 3:12 (BSB)

Then Abner sent messengers on his behalf to say to David, “To whom does the land belong? Make your covenant with me, and surely my hand will be with you to bring all Israel over to you.”

From 2 Samuel 3. Also in the ESV.

Commentary on 2 Samuel 3:12

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on 2 Samuel 3:7-21: 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.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on 2 Samuel 3:12: And Abner sent messengers to David on his behalf,.... On his own account, and not on the account of Ishbosheth, or the people of Israel; but to obtain terms for himself, or in his own name, as representing him and standing in his stead; or secretly, as Kimchi explains it, unknown to Ishbosheth, or the people of Israel.
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on 2 Samuel 3:12: 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.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on 2 Samuel 3:6-39: 2Sa 3:6-39 Decline of the House of Saul. - 2Sa 3:6-11. Abner’s quarrel with Ishbosheth. - During the war between the house of Saul and the house of David, Abner adhered firmly to the house of Saul, but he appropriated one of Saul’s concubines to himself.