With a young bullock — That is, with the blood of it; the body of it was to be offered upon the altar of burnt — offerings. A sin — offering — For his own and family's sins; for a goat was offered for the sins of the people.
Related Commentaries of Leviticus 16:3
Leviticus 16:3
3 Thus shall Aaron come into the holy place: with a young bullock for a sin offering, and a ram for a burnt offering.