After forty years. — The reading is certainly incorrect. Absalom was born after David began his reign in Hebron, and his whole reign was only forty years. Absalom therefore was not yet forty at his death. The reading found in the Syriac and most MSS. of the Vulgate, and adopted by Josephus, four years, is probably correct. It remains uncertain from what point this four years is to be reckoned; probably it is from Absalom’s return to Jerusalem.
Pay my vow... in Hebron. — We have no means of knowing whether this vow was real or fictitious; certainly Absalom now uses it as a pretext, and yet there is nothing improbable in his having actually made such a vow during his exile. Hebron was the place of his birth and childhood, as well as a holy city from very ancient times, and was thus a suitable place for the performance of his vow; it was also at a convenient distance from Jerusalem, and had been the royal city of David for the first seven years of his reign. It was thus well adapted to be the starting place of Absalom’s rebellion, and it is not unlikely, moreover, that the men of Hebron may have resented the transfer of the capital to Jerusalem, and therefore have lent a willing ear to Absalom. Like many other culprits, Absalom veils his crime under the cloak of religion, pretending submission to his father, and receiving his blessing at the very moment when he is striking at his crown and his life.