The covenant of priesthood must be made by sacrifice, as well as other covenants, Psa 50:5. And thus Christ was consecrated by the sacrifice of himself, once for all. Sacrifices of each kind must be offered for the priests, that they might with the more tenderness and concern offer the gifts and sacrifices of the people, with compassion on the ignorant, and on those that were out of the way, not insulting over those for whom sacrifices were offered, remembering that they themselves had had sacrifices offered for them, being compassed with infirmity. 1. A bullock, the largest sacrifice, was offered for a sin-offering (Lev 8:14), that hereby atonement might be made, and they might not bring any of the guilt of the sins of their former state into the new character they were now to put on. When Isaiah was sent to be a prophet, he was told to his comfort, Thy iniquity is taken away, Isa 6:7. Ministers, that are to declare the remission of sins to others, should give diligence to get it made sure to themselves in the first place that their own sins are pardoned. Those to whom is committed the ministry of reconciliation must first be reconciled to God themselves, that they may deal for the souls of others as for their own. 2. A ram was offered for a burnt-offering, Lev 8:18-21. By this they gave to God the glory of this great honour which was now put upon them, and returned him praise for it, as Paul thanked Christ Jesus for putting him into the ministry, Ti1 1:12. They also signified the devoting of themselves and all their services to the honour of God. 3. Another ram, called the ram of consecration, was offered for a peace-offering, Lev 8:22, etc. The blood of it was part put on the priests, on their ears, thumbs, and toes, and part sprinkled upon the altar; and thus he did (as it were) marry them to the altar, upon which they must all their days give attendance. All the ceremonies about this offering, as those before, were appointed by the express command of God; and, if we compare this chapter with Ex. 29, we shall find that the performance of the solemnity exactly agrees with the precept there, and in nothing varies. Here, therefore, as in the account we had of the tabernacle and its vessels, it is again and again repeated, As the Lord commanded Moses. And thus Christ, when he sanctified himself with his own blood, had an eye to his Father's will in it. As the Father gave me commandment so I do, Joh 14:31; Joh 10:18; Joh 6:38.

The bullock for the sin-offering - This was offered each day during the seven days of consecration. See Exo 29:36.

And he slew it,.... Not Aaron, nor any of his sons, who as yet were not fully consecrated and installed into their office, but Moses, as follows:

and Moses took the blood; which was received into a basin when the bullock was slain:

and put it upon the horns of the altar round about with his finger; upon the four horns of the altar, which were at the four corners of it, and dipping his finger into the blood, he besmeared the horns with it, and drew it about with his finger here and there; and so is said to be done round about the altar, as these horns were:

and purified the altar; or cleansed it; not from moral guilt and pollution, which it was incapable of, but from all ceremonial pollution it might be supposed to have:

and poured the blood at the bottom of the altar; the rest of the blood he did not use about the horns:

and sanctified it; separated it from common to sacred use:

to make reconciliation upon it; that it might be fit to have sacrifices offered on it to make atonement and reconciliation for sins; for which reason it was necessary it should itself be pure and holy, in such sense it was capable of being so.

brought the bullock for the sin offering, &c.--a timely expression of their sense of unworthiness--a public and solemn confession of their personal sins and a transference of their guilt to the typical victim.