Leviticus 15:25-31

“If a woman has a flow of blood for many days that is unrelated to her menstrual period, or if the blood continues beyond the normal period, she is ceremonially unclean. As during her menstrual period, the woman will be unclean as long as the discharge continues. Any bed she lies on and any object she sits on during that time will be unclean, just as during her normal menstrual period. If any of you touch these things, you will be ceremonially unclean. You must wash your clothes and bathe yourself in water, and you will remain unclean until evening. “When the woman’s bleeding stops, she must count off seven days. Then she will be ceremonially clean. On the eighth day she must bring two turtledoves or two young pigeons and present them to the priest at the entrance of the Tabernacle. The priest will offer one for a sin offering and the other for a burnt offering. Through this process, the priest will purify her before the LORD for the ceremonial impurity caused by her bleeding. “This is how you will guard the people of Israel from ceremonial uncleanness. Otherwise they would die, for their impurity would defile my Tabernacle that stands among them.