Leviticus 22:4-7

4None 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,

5and whoever touches a swarming thing by which he may be made unclean or a person from whom he may take uncleanness, whatever his uncleanness may be—

6the 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.

7When the sun goes down he shall be clean, and afterward he may eat of the holy things, because they are his food.