Leviticus 15:3-7

This, moreover, shall be his uncleanness in his discharge: it is his uncleanness whether his body allows its discharge to flow or whether his body obstructs its discharge.

Every bed on which the man with the discharge lies becomes unclean, and everything on which he sits becomes unclean.

Anyone, moreover, who touches his bed shall wash his clothes and bathe in water and be unclean until evening;

and whoever sits on the thing on which the man with the discharge has been sitting, shall wash his clothes and bathe in water and be unclean until evening.

Also whoever touches the man with the discharge shall wash his clothes and bathe in water and be unclean until evening.