Midrash for Chullin 278:63
עוף משמע לן בין טהור בין טמא
Come and hear: It is written: And thou, son of man, [thus saith the Lord God]: Speak unto the zippor of every sort.<span class="x" onmousemove="('comment',' Lit., 'of every winged (species) '. Ezek. XXXIX, 17.');"><sup>34</sup></span>
Sifrei Devarim
(Devarim 22:6) "If there chance before you a bird's nest": to exclude what is normally found there.
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