Reference for Chullin 184:21

גיד הנשה מחטט אחריו בכל מקום שהוא וחותך שמנו מעיקרו דברי ר"מ

For it has been taught: As to the sciatic nerve, one must follow it up as far as it goes and must cut away the fat thereof at its source;<span class="x" onmousemove="('comment',' Wherever the fat is found, in all its ramifications.');">⁹</span>

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