Leviticus 9:2 (BSB)

He said to Aaron, “Take for yourself a young bull for a sin offering and a ram for a burnt offering, both without blemish, and present them before the LORD.

From Leviticus 9. Also in the ESV.

Commentary on Leviticus 9:2

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Leviticus 9:1-7: Orders are here given for another solemnity upon the eighth day; for the newly-ordained priests were set to work immediately after the days of their consecration were finished, to let them know that they were not ordained to be idle: He that desires the office of a bishop desires a good work, which must be looked at with desire, more than the honour and benefit.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Leviticus 9:2: And he said unto Aaron,.... In the presence of the people of Israel: take thee a young calf for a sin offering; one not exceeding a year old, as in Lev 9:3 but this was not for the sin of making the calf only, to which the Jewish writers restrain it, but for all other sins of his, which it was necessary should be expiated...
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Leviticus 9:2: And he said unto Aaron, Take thee a young calf for a sin offering, and a ram for a burnt offering, without blemish, and offer [them] before the LORD. (b) Aaron enters into the possession of the priesthood: and offers the four principal sacrifices, the burnt offering, the sin offering, the peace offering, and the meat offering.
• Adam Clarke (Methodist), Clarke's Commentary on the Bible on Leviticus 9:2: Take thee a young calf, etc. - As these sacrifices were for Aaron himself, they are furnished by himself and not by the people, for they were designed to make atonement for his own sin. See Lev 4:3. And this is supposed by the Jews to have been intended to make an atonement for his sin in the matter of the golden calf.