Forty years - An obvious clerical error, though a very ancient one for four years, which may date from Absalom’s return from Geshur, or from his reconciliation with David, or from the commencement of the criminal schemes to which 2 Samuel 15:1 refers.
Hebron - This, as having been the old capital of David’s kingdom and Absalom’s birthplace, was well chosen. It was a natural center, had probably many inhabitants discontented at the transfer of the government to Jerusalem, and contained many of the friends of Absalom’s youth. As the place of his birth (compare 1 Samuel 20:6), it afforded a plausible pretext for holding there the great sacrificial feast (“the serving the Lord,” 2 Samuel 15:8), which Absalom pretended to have vowed to hold to the glory of God.