The saint — So called, because he was consecrated by God for that sacred office of the priesthood, in which respect all the priests are said to be holy, Leviticus 21:6-8. Hereby he intimates, that their envy and rebellion was not only against Aaron, but against God himself.
Related Commentaries of Psalms 106:16
Psalms 106:16
16 They envied Moses also in the camp, and Aaron the saint of the LORD.