C. F. Keil and Franz Delitzsch on 2 Samuel 15:12

2Sa 15:12

Moreover, Absalom sent for Ahithophel, David’s councillor, to come from his own town Giloh, when he offered the sacrifices. The unusual construction of את ישׁלח with מעירו may be explained from the pregnant character of the expression: he sent and bade come, i.e., he summoned Ahithophel out of his city. Giloh, Ahithophel’s home, was upon the mountains of Judah, to the south or south-west of Hebron (see at Jos 15:51). Ahithophel had no doubt been previously initiated into Absalom’s plans, and had probably gone to his native city, merely that he might come to him with the greater ease; since his general place of abode, as king’s councillor, must have been in Jerusalem. “And the conspiracy became strong; for the people multiplied continually with Absalom” (the latter is a circumstantial clause). These words give a condensed summary of the result of the enterprise.