Leviticus 15:19-23

19And if a woman shall have an issue, and her issue in her flesh be blood, she shall be put apart seven days: and whoever toucheth her shall be unclean until the evening.1 20And every thing that she lieth upon in her separation shall be unclean: every thing also that she sitteth upon shall be unclean. 21And whoever toucheth her bed shall wash his clothes, and bathe himself in water, and be unclean until the evening. 22And whoever toucheth any thing that she sat upon shall wash his clothes, and bathe himself in water, and be unclean until the evening. 23And if it be on her bed, or on any thing on which she sitteth, when he toucheth it, he shall be unclean until the evening.