Leviticus 4:25-27

New Revised Standard Version Catholic Edition

²⁵ The priest shall take some of the blood of the sin offering with his finger and put it on the horns of the altar of burnt offering, and pour out the rest of its blood at the base of the altar of burnt offering. ²⁶ All its fat he shall turn into smoke on the altar, like the fat of the sacrifice of well-being. Thus the priest shall make atonement on his behalf for his sin, and he shall be forgiven.

²⁷ If anyone of the ordinary people among you sins unintentionally in doing any one of the things that by the Lord’s commandments ought not to be done and incurs guilt,