Leviticus 15:10-11

MSB(i) 10 Whoever touches anything that was under him will be unclean until evening, and whoever carries such things must wash his clothes and bathe with water, and he will be unclean until evening. 11 If the man with the discharge touches anyone without first rinsing his hands with water, the one who was touched must wash his clothes and bathe with water, and he will be unclean until evening.