Comentario sobre Deuteronómio 14:21

לגר אשר בשעריך [YE SHALL NOT EAT ANY CARRION: THOU SHALT GIVE IT] UNTO THE STRANGER THAT IS IN THY GATES — i.e. unto a stranger that is a sojourner (גר תושב) — one who has undertaken not to worship idols (i.e. one who has been converted to the fundamental tenet of Judaism) but who eats carrion (does not obey the other teachings of the Torah) (Sifrei Devarim 104:2; cf. Rashi on Leviticus 25:35).

FOR THOU ART A HOLY PEOPLE UNTO THE ETERNAL THY G-D. The purport thereof is connected with [the following prohibition], Thou shalt not seethe a kid in its mother’s milk. Although it is not an abhorrent food [for both meat and milk are permitted separately] He prohibited it because we are to be holy in [choice of] foods — or because we [ourselves] are holy — that we not become a cruel people that is not compassionate²²²See Jeremiah 6:23. by milking the mother and extracting its milk to seethe therein its kid. And although any meat [cooked] in milk is included in this prohibition [even though it is not its own mother’s milk, a situation without apparent cruelty, nevertheless it is forbidden] because any nursing animal is called “mother” and any suckling offspring is called “kid,” and if they are together in the process of cooking there is [an element of] cruelty in all [cases whether a kid in its own mother’s milk or not].
Now, Rashi wrote: “Thou shalt not seethe a kid in its mother’s milk. This is stated three times²²³Here, and in Exodus 23:19, and 34:26. in order to exclude a wild beast, fowls,²²⁴However, the cooking and eating of a chayah (clean wild beast) or fowl with milk is forbidden though by the Rabbis (Yoreh Deiah 57:3). and unclean animals” [from this prohibition]. This interpretation is derived from the Scriptural use of the term kid [an expression that does not apply to any of the excluded categories]. However, the thrice repeated] prohibition itself [teaches the following:] one forbids eating [meat cooked with milk], one forbids deriving benefit from it, and one forbids cooking it. And so did the Rabbi [Rashi] write in the section of And these are the ordinances.²²⁵Exodus 23:19.

לא תאכלו כל נבלה, even of the pure species which you may eat after they have been slaughtered ritually.