Leviticus 15:5

And whosoever toucheth his bed
Is unclean. According to the Misnah ^F24, a bed defiles a man seven ways, so as to defile garments; standing, sitting, lying, hanging, and leaning, and by touching, and by bearing:

shall wash his clothes, and bathe [himself] in water;
in forty seahs of water, as the Targum of Jonathan:

and be unclean until the even;
be unfit for conversation with other men till the even, though both his body and clothes are washed.