Reference for Chullin 112:42

הכתה חולדה על ראשה מקום שאינו עושה אותה טרפה

Rabbah, others say R'Joshua B'Levi, said: The top of the crop is regarded as the gullet.<span class="x" onmousemove="('comment',' So that the slightest perforation there would render the bird trefah.');">¹⁶</span>

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