Leviticus 15

25 If a woman has a flow of blood for several days outside her monthly period or if her flow continues beyond her regular period, she remains unclean as long as the flow continues, just as she is during her monthly period. 26 Any bed on which she lies and anything on which she sits during this time is unclean. 27 Any who touch them are unclean and must wash their clothes and take a bath; they remain unclean until evening.