Deuteronomy 14:21

Ye shall not eat of any thing that dieth of itself: thou shalt give it unto the stranger that is in thy gates, that he may eat it; or thou mayest sell it unto an alien: for thou art an holy people unto the LORD thy God. Thou shalt not seethe a kid in his mother's milk.

Ye shall not eat of any thing that dieth of itself - (see the notes at Leviticus 17:15; Leviticus 22:8.)

Thou shalt give it unto the stranger - not a proselyte, because he, as well as an Israelite, was subject to this law; but a pagan traveler or sojourner.

Thou shalt not seethe a kid. This is the third place in which the prohibition is repeated. It was pointed against an annual pagan ceremony (see the notes at Exodus 23:19; Exodus 34:26).