Leviticus 22:8-10

⁸He shall not eat that which dies of itself, or is taken of beasts, so that he should be polluted by them: I am the Lord.

⁹And they shall keep my ordinances, that they do not bear iniquity because of them, and die because of them, if they shall profane them: I am the Lord God that sanctifies them.

¹⁰And no stranger shall eat the holy things: one that sojourns with a priest, or a hireling, shall not eat the holy things.