Komentaryo sa Deuteronomio 14:12: Rashi, Chizkuni, Tur HaArokh & Siftei Chakhamim

וזה אשר לא תאכלו מהם BUT THESE ARE THEY WHICH YOU MAY NOT EAT — This again is intended to forbid as food the bird that is slaughtered in the case of a leper (Sifrei Devarim 103:1-2; Kiddushin 57a).

וזה אשר לא תאכלו, “and these are the ones of which you may not eat;” Rashi explains that the word זה is meant to include that the prohibition includes if these birds had been of the permitted kind, but were used in the procedure prescribed for the sin offering of a leper. They must not be eaten even though slaughtered in the appropriate manner. (Compare Leviticus 14,4)

וזה אשר לא תאכלו, “this is the type of bird you may not eat;” this includes birds which have undergone ritual slaughter. The following had to be stated explicitly, as once no longer alive, such birds are susceptible to ritual impurity. One might have thought since the ritual impurity that had left the person stricken with tzoraat had been transferred to his offering, that offering had become contaminated. The Torah therefore indicates that this is not the case.