Leviticus 22:4-7

4“None of the offspring of Aaron who has tza'arat or has a discharge shall eat of the holy things until he is clean. Whoever touches anything that is unclean by the dead or a man whose seed discharges from him

5or who touches any creeping thing that may make him unclean or a person who is unclean—whatever his uncleanness—

6the person who touches any such thing will be unclean until the evening, and is not to eat of the holy things, unless he has bathed his body in water.

7When the sun sets, he will become clean, and afterward he may eat of the holy things, because it is his food.