Leviticus 22:4-6

22:4 No man from the descendants of Aaron who is diseased or has a discharge may eat the holy offerings until he becomes clean. The one who touches anything made unclean by contact with a dead person, or a man who has a seminal emission, 22:5 or a man who touches a swarming thing by which he becomes unclean, or touches a person by which he becomes unclean, whatever that person’s impurity – 22:6 the person who touches any of these will be unclean until evening and must not eat from the holy offerings unless he has bathed his body in water.