Commentary for Chullin 94:27

(שמות כב, ל) ובשר בשדה טרפה

We then inflate the lung; if it bubbles it is trefah, otherwise it is permitted, for then it is clear that the inner membrane only has been perforated, but not the outer one, and the sound is caused merely by the air vibrating between the two membranes.<span class="x" onmousemove="('comment',' V. supra 46b.');">¹¹</span>

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