Leviticus 15:5, 10, 21

And whosoever toucheth his bed shall wash his clothes, and bathe himself in water, and be unclean until the even.

And whosoever toucheth any thing that was under him shall be unclean until the even: and he that beareth any of those things shall wash his clothes, and bathe himself in water, and be unclean until the even.

And whosoever toucheth her bed shall wash his clothes, and bathe himself in water, and be unclean until the even.