Leviticus 15:4-9

“ ‘If the person who discharges the body fluid lies on a bed, that bed becomes unclean, and everything he sits on becomes unclean. Anyone who touches his bed must wash his clothes and bathe in water, and the person will be unclean until evening. Whoever sits on something that the person who discharges the fluid sat on must wash his clothes and bathe in water; he will be unclean until evening. Anyone who touches the person who discharges the body fluid must wash his clothes and bathe in water; he will be unclean until evening. “ ‘If the person who discharges the body fluid spits on someone who is clean, that person must wash his clothes and bathe in water; he will be unclean until evening. Everything on which the person who is unclean sits when riding will become unclean.