Matthew Henry 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. Judah had submitted to David as their king above seven years ago, and their ease and happiness, under his administration, encouraged the rest of the tribes to make their court to him. What numbers came from each tribe, with what zeal and sincerity they came, and how they were entertained for three days at Hebron, when they were all of one h…
Read the whole note in the consoleJamieson-Fausset-Brown 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.
Adam Clarke on 2 Samuel 5:3
They anointed David king - This was the third time that David was anointed, having now taken possession of the whole kingdom.
John Gill on 2 Samuel 5:4
David was thirty years old when he began reign,.... Over Judah, which was the age of his antitype Christ, when he entered upon his public ministry, Luke 3:23,
and he reigned forty years; and six months, as appears by 2 Samuel 5:5; but the months are not mentioned, only the round number of years given: two reasons the Jews (a) give for this; the one, that he fled six months from Absalom; the other is, that he was ill in Hebron so long, and therefore are not reckoned.
(a) Hieron. Trad. Heb. in lib. Reg. fol. 77. I.
Keil & Delitzsch