John Gill
INTRODUCTION TO Leviticus 9 Aaron and his sons, being consecrated to and invested with the priest's office, are called upon to the exercise of it, to offer a sin offering and a burnt offering for themselves, and all sorts of offerings, a sin offering, a burnt offering, peace offerings, and a meat offering, for the people; and a promise is made for their encouragement, that the glory of the Lord...
John Gill
But the fat, and the kidneys, and the caul [above] the liver of the sin [offering], he burnt upon the altar,.... The Septuagint version is, "he offered them": as the Lord commanded Moses; see Leviticus 4:8.
Matthew Henry
Aaron and his sons, having been solemnly consecrated to the priesthood, are in this chapter entering upon the execution of their office, the very next day after their consecration was completed. I. Moses (no doubt by direction from God) appoints a meeting between God and his priests, as the representatives of his people, ordering them to attend him, and assuring them that he would appear to them,...