Leviticus 8:36

So Aaron and his sons did - This chapter shows the exact fulfillment of the commands delivered to Moses, Exodus 29; and consequently the complete preparation of Aaron and his sons to fill the awfully important office of priests and mediators between God and Israel, to offer sacrifices and make atonement for the sins of the people. "Thus," says Mr. Ainsworth, "the covenant of the priesthood was confirmed unto the tribe of Levi in Aaron and his sons, which covenant was life and peace, Malachi 2:5. But these are made priests without an oath; also, there were many priests, because they were not suffered to continue by reason of death; and they served unto the example and shadow of heavenly things, offering gifts and sacrifices which could not make him who did the service perfect as pertaining to the conscience; for they were carnal ordinances imposed upon them till the time of reformation, that is, until the time of Christ, who was made a priest of God with an oath, and made surety of a better covenant established on better promises. And because he continueth for ever, he hath a priesthood which passeth not from one to another, and is a minister of the true tabernacle, which God pitched and not man. Not by the blood of bulls and of goats, but by his own blood, he entered once into the holy place, having found everlasting redemption for us; and is therefore able to save to the uttermost them who come unto God through him, as he ever liveth to make intercession for them." Taken in reference to his priesthood and sacrifice, all these rites and ceremonies are significant and edifying, but taken out of his relation, they would be as absurd and nugatory as the consecration of the Roman Pontifex Maximus, mentioned above by Prudentius.

8:36 So Aaron and his sons did all things - And thus the covenant of life and peace, Malachi 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, Hebrews 7:21 . For neither these priests, nor their priesthood was to continue. But His is a perpetual and unchangeable priesthood.