Leviticus 22:8-10

Amplified Bible

⁸ He shall not eat that which dies [of natural causes] or is torn by a predator, becoming unclean by it; I am the Lord. ⁹ Therefore the priests shall observe My ordinance, so that they will not bear sin because of it and die if they profane it; I am the Lord who sanctifies them.

¹⁰ ‘No layman [that is, someone outside of Aaron’s family] is to eat the holy gift [which has been offered to God]; a foreigner residing with the priest or a hired man shall not eat the holy thing.