Leviticus 5:8-10

New Revised Standard Version Catholic Edition

⁸ You shall bring them to the priest, who shall offer first the one for the sin offering, wringing its head at the nape without severing it. ⁹ He shall sprinkle some of the blood of the sin offering on the side of the altar, while the rest of the blood shall be drained out at the base of the altar; it is a sin offering. ¹⁰ And the second he shall offer for a burnt offering according to the regulation. Thus the priest shall make atonement on your behalf for the sin that you have committed, and you shall be forgiven.