Reference for Chullin 186:25

אצדדין אי דץ ביה מידי שרי ואי לא אסיר

But it was taught that the outer is nearer the bone! - Rab Judah answered: That is so only [at the part] where the butchers cut it open.<span class="x" onmousemove="('comment',' When they are about to 'porge' the meat. There the outer nerve is near to the bone.');">¹²</span>

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