Leviticus 15:30-32

New Revised Standard Version Catholic Edition

³⁰ The priest shall offer one for a sin offering and the other for a burnt offering; and the priest shall make atonement on her behalf before the Lord for her unclean discharge.

³¹ Thus you shall keep the people of Israel separate from their uncleanness, so that they do not die in their uncleanness by defiling my tabernacle that is in their midst.

³² This is the ritual for those who have a discharge: for him who has an emission of semen, becoming unclean thereby,