신명기 14:11 해설: Rashi, Chizkuni, Ibn Ezra & Siftei Chakhamim

כל צפור טהרה תאכלו ALL CLEAN BIRDS YOU MAY EAT — 'All' — this is intended to permit as food also the bird that is set free in the case of a leper (i.e. at his purification rite; Leviticus 14:7) (Sifrei Devarim 103:1; Kiddushin 57a).

כל צפור טהורה, “any ritually pure bird;” whenever the Torah uses the term צפור instead of עוף for “bird,” it is automatically referring to a ritually pure species of birds. The latter term, however, is used on different occasions for either category of birds. Ritually impure birds are always described as עוף. (Sifri)

bird is a generic term, as I explained earlier [comment on Genesis 15: 10], when I pointed out that “turtle-dove” [Genesis 15: 9] and “pigeon” [Genesis 15: 9] were two individual species within the same generic term. Similarly, dayyah and raכah are specific terms classified under the more general term “ da כ ah ” [Leviticus 11: 14]; here Scripture gives additional detail.