Reference for Chullin 124:27

התם כי רפי איקליף בידא הכא אע"ג דרפי לא מקליף אלא בסכינא

But was there not a case of a duck belonging to Mar Samuel, the gizzard of which could not be peeled, so it was left in the sun, and as soon as it became soft it peeled easily?<span class="x" onmousemove="('comment',' It is thus seen that even in the case of permitted birds it is sometimes difficult to peel the gizzard.');">¹⁸</span>

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