Albert Barnes Commentary Psalms 106:16

"They envied Moses also in the camp, [And] Aaron the saint of Jehovah." — Psalms 106:16 (ASV)

They envied Moses also in the camp - They were envious of him, or rebelled against him, as assuming too much authority. See Numbers 16:1-2. The reference here is rather to the result of that envy in producing rebellion than to the envy itself. It is true, however, that the foundation of their opposition to him was envy.

And Aaron the saint of the Lord - That is, as set apart to the service of the Lord; or, as employed in holy things. The reference is to his office, not to his personal character.