the priest's lips, &c. This was the first duty of the priests, and was more important than their ceremonial duties. Reference to Pentateuch (Leviticus 10:11.Deuteronomy 17:11; Deuteronomy 33:10). App-92.
knowledge: i.e. esp. of the law.
they: i.e. the People; according to Deuteronomy 17:9-11.