Reference for Chullin 280:1

אם כן צפור למעוטי עוף טמא ל"ל

- If that were so, then the teaching that the term zippor' excludes an unclean bird is superfluous.<span class="x" onmousemove="('comment',' For if by making this comparison a trefah dam is excluded, then in like manner an unclean bird would also be excluded, thus rendering the interpretation derived from the term 'zippor' unnecessary.');">¹</span>

Rashi on Deuteronomy

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