Leviticus 15:24

And whosoever toucheth any thing that she sat upon shall wash his clothes, and bathe [himself] in water, and be unclean until the even.

And if it [be] on [her] bed, or on any thing whereon she sitteth, when he toucheth it, he shall be unclean until the even.

And if a woman have an issue of her blood many days out of the time of her separation, or if it run beyond the time of her separation; all the days of the issue of her uncleanness shall be as the days of her separation: she [shall be] unclean.

Every bed whereon she lieth all the days of her issue shall be unto her as the bed of her separation: and whatsoever she sitteth upon shall be unclean, as the uncleanness of her separation.