Leviticus 4:31-33 New Revised Standard Version Catholic Edition (NRSVCE)
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. 33 You shall lay your hand on the head of the sin offering; and it shall be slaughtered as a sin offering at the spot where the burnt offering is slaughtered.