Leviticus 8:36

“So Aaron and his sons did all things which the Lord commanded by the hand of Moses.] They submitted to have them done to them, and for them, what was done on the first day of their consecration, all the rest of the days; and they kept within the tabernacle all that time as was enjoined them.”

“Moses as the mediator of the covenant of the Law Galatians 3:19; Hebrews 8:6 was called to perform the priestly functions, in consecrating those on whom henceforth those functions were to devolve, and in inaugurating the legal order of sacrifices. See Exodus 40:23 note. The sin-offering was now offered for the first time. The succession in which the sacrifices followed each other on this occasion, first the sin-offering, then the burnt-offering, and lastly the peace-offering, has its ground in the meaning of each sacrifice, and became the established custom in later ages. The worshipper passed through a spiritual process. He had transgressed the Law, and he needed the atonement signified by…”

“So Aaron and his sons did all things - And thus the covenant of life and peace, Mal 2:5, was made with them. But after all the ceremonies used in their consecration, one point was reserved for the honour of Christ's priesthood. They were made priests without an oath; but Christ with an oath, Heb 7:21. For neither these priests, nor their priesthood was to continue. But His is a perpetual and unchangeable priesthood. Next: Leviticus Chapter 9”

“Aaron: This was necessary to be added, to show the exact fulfilment of the commandments delivered to Moses, and which are recorded in Exodus 29; and consequently the complete consecration and preparation of Aaron and his sons to fill the awfully important office of priests and mediators between God and the children of Israel, to offer sacrifices, and make atonement for the sins of the people. Exo 39:43, Exo 40:16; Deu 4:2, Deu 12:32; Sa1 15:22 Next: Leviticus Chapter 9”