Leviticus 15:21-23

And whosoever toucheth her bed shall wash his clothes, and bathe himself in water, and be unclean until the even. And whosoever toucheth anything that she sitteth upon shall wash his clothes, and bathe himself in water, and be unclean until the even. And if it be on the bed, or on anything whereon she sitteth, when he toucheth it, he shall be unclean until the even.