Leviticus 5:6-8

New Revised Standard Version Catholic Edition

⁶ And you shall bring to the Lord, as your penalty for the sin that you have committed, a female from the flock, a sheep or a goat, as a sin offering; and the priest shall make atonement on your behalf for your sin.

⁷ But if you cannot afford a sheep, you shall bring to the Lord, as your penalty for the sin that you have committed, two turtledoves or two pigeons, one for a sin offering and the other for a burnt offering. 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.