Leviticus 9:2 - Matthew Poole's English Annotations on the Holy Bible

A young calf, Heb. a calf, the son of a bull or cow; which may seem to be added purposely to intimate that it was not a young calf properly so called, but a young bullock, for that was the sacrifice enjoined for the high priest's sin-offering, Leviticus 4:3. Though it be not material, if this be a young calf, and that a young bull, because the grounds and ends of the several sacrifices differ, that Le 4: being for his particular sin, and this for his own and family's sins in general, and therefore no wonder if the sacrifices also differ. For a sin offering, for himself and his own sins, which was an evidence of the imperfection of that priesthood, and of the necessity of another and a better.