Reference for Chullin 280:24

קורא זכר רבי אליעזר מחייב וחכמים פוטרין:

for the Mishnah expressly says: A COCK PARTRIDGE! - One might have thought that even the hen partridge the Rabbis exempt [from letting go], but the reason why the cock partridge was stated [in the Mishnah] was to set forth the extent of R'Eliezer's view; we are therefore taught [that it is not so].

Rashi on Deuteronomy

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