2 Samuel 15:8,9 - Joseph Benson’s Commentary on the Old and New Testaments

If the Lord shall bring me again to Jerusalem, &c. This vow, we see, of Absalom is conceived exactly in the style of the patriarchal piety; and plainly implies, that however he was tempted by his grandfather to serve the gods of Geshur, yet he continued steady to the true religion, and determined against idolatry. This, we may be sure, David was highly delighted to hear, and therefore gave a ready consent to the performance of his vow, saying, Go in peace. So he arose and went to Hebron This place he chose as being an eminent city, and next to Jerusalem, the chief city of the tribe of Judah. It was also the place of his birth, the place where his father had begun his kingdom, which he took for a good omen, and where the seat of government had been several years. Here, likewise, they were wont to sacrifice till the temple was built. It was at a convenient distance from Jerusalem, and, no doubt, he had here secured many friends. He therefore thought it the most commodious place for his purpose, next to Jerusalem.