Reference for Chullin 280:27

אמר ר"א

For the Mishnah expressly says: AS TO A COCK PARTRIDGE? - One might have thought that even the male of any other bird R'Eliezer declares one bound [to let go], but the reason why the cock partridge was stated was to set forth the extent of the Rabbis'<span class="x" onmousemove="('comment',' The Sages.');">¹⁴</span>

Rashi on Deuteronomy

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