Then he presented the people’s offering and took the goat of the sin offering that was for the people and killed it and offered it as a sin offering, like the first one.
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.
Commenting on Leviticus 9:8-22
And he brought the burnt offering,.... The calf and the lamb, Lev 9:3. and offered it according to the manner; judgment, ordinance, and appointment of God respecting that sort of offerings; see Lev 1:1.
Lev 9:15-21 Of the sacrifices of the nation, Aaron presented the sin-offering in the same manner as the first, i.e., the one offered for himself (Lev 9:8.). The blood of this sin-offering, which was presented for the congregation, was not brought into the holy place according to the rule laid down in Lev 7:16., but only applied to the horns of the altar of burnt-offering...
Commenting on Leviticus 9:15-21