Leviticus 22:1-9

The LORD said to Moses, “Tell Aaron and his sons to treat with respect the sacred offerings the Israelites consecrate to me, so they will not profane my holy name. I am the LORD. “Say to them: ‘For the generations to come, if any of your descendants is ceremonially unclean and yet comes near the sacred offerings that the Israelites consecrate to the LORD, that person must be cut off from my presence. I am the LORD. “ ‘If a descendant of Aaron has a defiling skin disease or a bodily discharge, he may not eat the sacred offerings until he is cleansed. He will also be unclean if he touches something defiled by a corpse or by anyone who has an emission of semen, or if he touches any crawling thing that makes him unclean, or any person who makes him unclean, whatever the uncleanness may be. The one who touches any such thing will be unclean till evening. He must not eat any of the sacred offerings unless he has bathed himself with water. When the sun goes down, he will be clean, and after that he may eat the sacred offerings, for they are his food. He must not eat anything found dead or torn by wild animals, and so become unclean through it. I am the LORD. “ ‘The priests are to perform my service in such a way that they do not become guilty and die for treating it with contempt. I am the LORD, who makes them holy.