Leviticus 22:4-6

“ ‘If one of Aaron’s descendants has a harmful skin disease, or if he discharges a body fluid, he cannot eat the holy offerings until he becomes clean. He could also become unclean from touching a dead body, from his own semen, from touching any unclean crawling animal, or from touching an unclean person (no matter what made the person unclean). Anyone who touches those things will become unclean until evening. That person must not eat the holy offerings unless he washes with water.