Sin-Offering: Consisted of a Young Bullock for Priests

If the anointed priest sins, bringing guilt on the people, he must bring to the LORD a young bull without blemish as a sin offering for the sin he has committed.

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.

So Aaron approached the altar and slaughtered the calf as a sin offering for himself.

This is how Aaron is to enter the Holy Place: with a young bull for a sin offering and a ram for a burnt offering.

Aaron is to present the bull for his sin offering and make atonement for himself and his household.