Leviticus 22:4-7

4“If any of Aaron’s descendants has a skin disease or any kind of discharge that makes him ceremonially unclean, he may not eat from the sacred offerings until he has been pronounced clean. He also becomes unclean by touching a corpse, or by having an emission of semen,

5or by touching a small animal that is unclean, or by touching someone who is ceremonially unclean for any reason.

6The man who is defiled in any of these ways will remain unclean until evening. He may not eat from the sacred offerings until he has bathed himself in water.

7When the sun goes down, he will be ceremonially clean again and may eat from the sacred offerings, for this is his food.