Leviticus 9:8

Accordingly, he offered first of all the sin-offering and burnt-offering for himself, and then (Lev 9:15-21) the offerings of the people. The sin-offering always went first, because it served to remove the estrangement of man from the holy God arising from sin, by means of the expiation of the sinner, and to clear away the hindrances to his approach to God. Then followed the burnt-offering, as an expression of the complete surrender of the person expiated to the Lord; and lastly the peace-offering, on the one hand as the utterance of thanksgiving for mercy received, and prayer for its further continuance, and on the other hand, as a seal of covenant fellowship with the Lord in the sacrificial meal. But when Moses says in Lev 9:7, that Aaron is to make atonement for himself and the nation with his sin-offering and burnt-offering, the atoning virtue which Aaron's sacrifice was to have for the nation also, referred not to sins which the people had committed, but to the guilt which the high priest, as the head of the whole congregation, had brought upon the nation by his sin (Lev 4:3). In offering the sacrifices, Aaron was supported by his sons, who handed him the blood to sprinkle, and the sacrificial portions to burn upon the altar. The same course was adopted with Aaron's sin-offering (Lev 9:8-11) as Moses had pursued with the sin-offering at the consecration of the priests (Lev 8:14-17). The blood was not taken into the sanctuary, but only applied to the horns of the altar of burnt-offering; because the object was not to expiate some particular sin of Aaron's, but to take away the sin which might make his service on behalf of the congregation displeasing to God; and the communion of the congregation with the Lord was carried on at the altar of burnt-offering. The flesh…

These being the first offerings that ever were offered by the levitical priesthood, according to the newly-enacted law of sacrifices, the manner of offering them is particularly related, that it might appear how exactly they agreed with the institution. 1. Aaron with his own hands slew the offering (Lev 9:8), and did the work of the inferior priests; for, great as he was, he must not think any service below him which he could do for the honour of God: and, as Moses had shown him how to do this work decently and dexterously, so he showed his sons, that they might do likewise; for this is the best way of teaching, and thus parents should instruct their children by example. Therefore as Moses before, so Aaron now offered some of each of the several sorts of sacrifices that were appointed, whose rites differed, that they might be thoroughly furnished for every good work. 2. He offered these besides the burnt-sacrifice of the morning, which was every day offered first, Lev 9:17. Note, Our accustomed devotions morning and evening, alone and in our families, must not be omitted upon any pretence whatsoever, no, not when extraordinary services are to be performed; whatever is added, these must not be diminished. 3. It is not clear whether, when it is said that he burnt such and such parts of the sacrifices upon the altar (Lev 9:10-20), the meaning is that he burnt them immediately with ordinary fire, as formerly, or that he laid them upon the altar ready to be burnt with the fire from heaven which they expected (Lev 9:24), or whether, as bishop Patrick thinks, he burnt the offerings for himself with ordinary fire, but when they were burnt out he laid the people's sacrifices upon the altar, which were kindled and consumed by the fire of the Lord. I would rather conjecture, becau…