Leviticus 15:28-31

28“But if she is cleansed of her discharge, then she is to count off seven days for herself, and after that she will be clean.

29On the eighth day she is to take two turtledoves or two young pigeons, and bring them to the kohen, at the entrance of the Tent of Meeting.

30The kohen is to offer the one for a sin offering, and the other for a burnt offering. So the kohen will make atonement for her before Adonai for the uncleanness of her discharge.

31“So you are to keep Bnei-Yisrael separate from their uncleanness, so they will not die in their uncleanness by defiling My Tabernacle that is in their midst.”