Leviticus 15:19-23

19And if a woman have an issue, and her issue in her flesh be blood, she shall be in her impurity seven days: and whosoever toucheth her shall be unclean until the even. 20And everything that she lieth upon in her impurity shall be unclean: everything also that she sitteth upon shall be unclean. 21And whosoever toucheth her bed shall wash his clothes, and bathe himself in water, and be unclean until the even. 22And whosoever toucheth anything that she sitteth upon shall wash his clothes, and bathe himself 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.