Commentary for Chullin 94:40
בחמימי לא דכווצי בקרירי לא דמטרשי
R'Aha, son of Raba, asked R'Ashi, How would we know it? - He replied: We take a glazed earthen basin, [pierce the lung] and pour it out into the basin, if there are seen any white streaks it is trefah,<span class="x" onmousemove="('comment',' The white streaks are particles of the bronchial tubes which have been destroyed within.');"><sup>14</sup></span>
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