While David was coming to the summit, where God was worshiped, behold, Hushai the Archite came to meet him with his coat torn and dirt on his head.
Nothing, it seems, appeared to David more threatening in Absalom's plot than that Ahithophel was in it; for one good head, in such a design, is worth a thousand good hands. Absalom was himself no politician, but he had got one entirely in his interest that was, and would be the more dangerous because he had been all along acquainted with David's counsels and affairs...
Commenting on 2 Samuel 15:31-37
And it came to pass, that when David was come to the top of the mount,.... Of the mount of Olives: where he worshipped God; by prayer and praise; here very probably he composed and sung the third psalm Psa 3:1, which, as the title shows, was made when he fled from Absalom: behold, Hushai the Archite came to meet him, with his coat rent...
when David was come to the top of the mount, where he worshipped--looking towards Jerusalem, where were the ark and tabernacle. Hushai the Archite--A native of Archi, on the frontiers of Benjamin and Ephraim (Jos 16:2). Comparing the prayer against Ahithophel with the counsel to Hushai, we see how strongly a spirit of fervent piety was combined in his character with the devices of an active and far-seeing policy.