Leviticus 15:19-23

19And if a woman have a flux, and her flux in her flesh be blood, she shall be seven days in her separation, and whoever toucheth her shall be unclean until the even.

20And everything that she lieth upon in her separation shall be unclean; and everything that she sitteth upon shall be unclean.

21And whoever toucheth her bed shall wash his garments, and bathe in water, and be unclean until the even.

22And whoever toucheth any object that she sat upon shall wash his garments, and bathe in water, and be unclean until the even.

23And if it be on the bed, or on anything whereon she sitteth, when he toucheth it, he shall be unclean until the even.