TSK · Leviticus 16:11

Moses then said to Aaron,“Approach the altar and make your sin offering and your burnt offering, and make atonement on behalf of yourself and on behalf of the people; and also make the people’s offering and make atonement on behalf of them just as the LORD has commanded.”

Then Aaron is to present the sin offering bull which is for himself and is to make atonement on behalf of himself and his household.

But only the high priest enters once a year into the inner tent, and not without blood that he offers for himself and for the sins of the people committed in ignorance.