Reference for Chullin 280:2

והתניא

But it has been taught: The dam of young that is trefah, one is bound to let go!<span class="x" onmousemove="('comment',' It is assumed that the Baraitha means this: if the young ones were trefah and the dam was not, one is bound to let the dam go; thus in conflict with R. Kahana.');">²</span>

Rashi on Deuteronomy

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