Leviticus 15:25-27

25“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.

26Any bed she lies on and any object she sits on during that time will be unclean, just as during her normal menstrual period.

27If 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.