Leviticus 22:4; Leviticus 22:6

4 None of the offspring of Aaron who has a leprous disease or a discharge may eat of the holy things until he is clean. Whoever touches anything that is unclean through contact with the dead or a man who has had an emission of semen,

6 the person who touches such a thing shall be unclean until the evening and shall not eat of the holy things unless he has bathed his body in water.