Leviticus 15:5, 10-11

Anyone who touches his bed is to wash his clothes and bathe with water, and he will remain unclean until evening.

Whoever touches anything that was under him will be unclean until evening, and whoever carries such things is to wash his clothes and bathe with water, and he will remain unclean until evening. If the man with the discharge touches anyone without first rinsing his hands in water,  the person who was touched is to wash his clothes and bathe with water, and he will remain unclean until evening.