Leviticus 15:28-31

28And if she be cleansed of her flux then she shall count seven days, and after that she shall be clean.

29And on the eighth day she shall take two turtle-doves, or two young pigeons, and bring them unto the priest, unto the entrance of the tent of meeting.

30And the priest shall offer the one as a sin-offering, and the other as a burnt-offering; and the priest shall make atonement for her before Jehovah for the flux of her uncleanness.

31And ye shall separate the children of Israel from their uncleanness, that they die not in their uncleanness, when they defile my tabernacle that is in their midst.