Adam Clarke on 2 Samuel 15:27

Art not thou a seer? return into the city in peace - That is, As thou art the only organ of the public worship, that worship cannot be carried on without thee; and as thou art the priest of God, thou hast no cause to fear for thy personal safety: the nation has not abandoned their God, though they have abandoned their king. It appears also, that he wished these priests, by means of their sons, Ahimaaz the son of Zadok, and Jonathan the son of Abiathar, to send him frequent intelligence of the motions and operations of the enemy.