Leviticus 4:30-32

New Revised Standard Version Catholic Edition

³⁰ The priest shall take some of its blood with his finger and put it on the horns of the altar of burnt offering, and he shall pour out the rest of its blood at the base of the altar. ³¹ He shall remove all its fat, as the fat is removed from the offering of well-being, and the priest shall turn it into smoke on the altar for a pleasing odor to the Lord. Thus the priest shall make atonement on your behalf, and you shall be forgiven.

³² If the offering you bring as a sin offering is a sheep, you shall bring a female without blemish.