Leviticus 22:4-8

No man of the descendants of Aaron, who has leprosy or has a discharge, may eat of the holy gifts until he is clean. And one who touches anything made unclean by a corpse, or a man who has a seminal emission,

or a man who touches any swarming things by which he is made unclean, or touches any person by whom he is made unclean, whatever his uncleanness;

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

But when the sun sets, he will be clean, and afterward he may eat of the holy gifts, for it is his food.

He shall not eat an animal which dies or is torn by animals, becoming unclean by it; I am the Lord.