Leviticus 15:25-30

25If a woman is bleeding for more than seven days, she is unclean. She is unclean all the time that she is bleeding.

26The bed that the woman lies on becomes unclean. Anything that the woman sits on is unclean.

27If another person touches the chair, he becomes unclean. He must wash his clothes and his body. He will be unclean until evening. If another person touches the bed, he will also become unclean. He must wash his clothes and his body. He will be unclean until evening.

28When the woman stops bleeding, she must count seven days. Then she will be clean.

29On the eighth day, she must take two birds to the door of the Tent of Meeting. They must be doves or pigeons. She must give them to the priest. He will sacrifice one bird for her sin and he will burn the other.

30He will kill them as an atonement to the Lord. Then the woman will be clean.