TSK · Leviticus 4:3

But the meat of the bull, its skin, and its dung you are to burn up outside the camp. It is the purification offering.

Aaron is to make atonement on its horns once in the year with some of the blood of the sin offering for atonement; once in the year he is to make atonement on it throughout your generations. It is most holy to the LORD.”

Animal from the Flock“‘If his offering is from the flock for a burnt offering– from the sheep or the goats– he must present a flawless male,

and he must bring his penalty for guilt to the LORD for his sin that he has committed, a female from the flock, whether a female sheep or a female goat, for a sin offering. So the priest will make atonement on his behalf for his sin.

He then poured some of the anointing oil on the head of Aaron and anointed him to consecrate him.

Then tell the Israelites:‘Take a male goat for a sin offering and a calf and lamb, both a year old and flawless, for a burnt offering,

He must also take two male goats from the congregation of the Israelites for a sin offering and one ram for a burnt offering.

The Sin Offering Sacrificial Procedures“Aaron is to present the sin offering bull which is for himself, and he is to make atonement on behalf of himself and his household. He is to slaughter the sin offering bull which is for himself,

Then they are to take a young bull with its grain offering of fine flour mixed with olive oil; and you are to take a second young bull for a purification offering.

In the porch of the gate were two tables on either side on which to slaughter the burnt offering, the sin offering, and the guilt offering.

On the day he enters the sanctuary, into the inner court to serve in the sanctuary, he must offer his sin offering, declares the Sovereign LORD.

God made the one who did not know sin to be sin for us, so that in him we would become the righteousness of God.

He has no need to do every day what those priests do, to offer sacrifices first for their own sins and then for the sins of the people, since he did this in offering himself once for all.