Leviticus 9:7

“And Moses said unto Aaron, etc.] This is only observed to show, that as Aaron did not take upon him this office of himself, but was called unto it, and invested with it, by the appointment of God, so neither did he enter upon it but through the call of God by Moses, in the sight of the congregation: go unto the altar, and offer thy sin [offering], and thy burnt offering; the young calf and ram: and make an atonement for thyself and for the people; first for himself, and then for the people; for, as Aben Ezra says, a man cannot atone for another until he is pure from all sin; which is a character only to be found in Christ, our great High Priest, and so a proper person to atone for and take…”

“It is to be remarked that Aaron offers no peace-offering for himself. It was enough that he should participate in the peace-offerings of the consecration Leviticus 8:31, and in the two peace-offerings about to be sacrificed for the people. His sin-offering was probably regarded not so much as a sacrifice for his own actual sins as a typical acknowledgment of his sinful nature and of his future duty to offer for his own sins and those of the People. See marginal references. “The law maketh men high priests which have infirmity; but the word of the oath, which was since the law, maketh the Son, who is consecrated (in the margin perfected, see Leviticus 8:22 note) forevermore, Hebrews 7:28.…”

“Go and offer - Moses had hitherto sacrificed, but now he resigns his work to Aaron, and actually gives him that commission which from God he had received for him. For thyself and for the people - The order is very observable, first for thyself, otherwise thou art unfit to do it for the people. Hereby God would teach us, both the deficiency of this priesthood, and how important it is that God's ministers should be in the favour of God themselves, that their ministrations may be acceptable to God, and profitable to the people. Leviticus 9:9”

“9:7 your sin offering . . . burnt offering: Before the high priest could make atonement for the people, he had to be right with God himself.”

“offer thy: Lev 9:2, Lev 4:3, Lev 4:20, Lev 8:34; Sa1 3:14; Heb 5:3, Heb 7:27, Heb 7:28, Heb 9:7 offer the: Lev 4:16-20; Heb 5:1 Leviticus 9:8”