2 Samuel 5:3 (BSB)

So all the elders of Israel came to the king at Hebron, where King David made with them a covenant before the LORD. And they anointed him king over Israel.

From 2 Samuel 5. Also in the ESV.

Commentary on 2 Samuel 5:3

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on 2 Samuel 5:1-5: Here is, I. The humble address of all the tribes to David, beseeching him to take upon him the government (for they were now as sheep having no shepherd), and owning him for their king. Though David might by no means approve the murder of Ish-bosheth, yet he might improve the advantages he gained thereby, and accept the applications made to him thereupon.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on 2 Samuel 5:3: So all the elders of Israel came to the king to Hebron,.... Which either explains what is meant by the tribes coming to him, Sa2 5:1; namely, coming by their elders as their representatives; or else the meaning is, that the messengers the tribes sent, when they returned and reported the favourable reception they had met with from David; the elders of the several tribes...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on 2 Samuel 5:3: King David made a league with them in Hebron before the Lord--(see on Sa1 10:17). This formal declaration of the constitution was chiefly made at the commencement of a new dynasty, or at the restoration of the royal family after a usurpation (Kg2 11:17), though circumstances sometimes led to its being renewed on the accession of any new sovereign (Kg1 12:4). It seems to have been accompanied by religious solemnities.
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on 2 Samuel 5:3: So all the elders of Israel came to the king to Hebron; and king David made a league with them in Hebron before the LORD: and they anointed David king over Israel. (b) That is, taking the Lord to witness: for the ark was still in Abinadab's house.