Leviticus 15:5, 10-11

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

And whosoever toucheth anything that was under him shall be unclean until the even: and he that beareth those things shall wash his clothes, and bathe himself in water, and be unclean until the even. And whomsoever he that hath the issue toucheth, without having rinsed his hands in water, he shall wash his clothes, and bathe himself in water, and be unclean until the even.