Reference for Chullin 96:35

והאמר רב נחמן

Rather, said R'Ashi, We must see: if the head<span class="x" onmousemove="('comment',' I.e., the thick head or knob of a pin or nail. It is assumed that a pin in the body would always travel point first and therefore if the point is turned inwards within an organ it must have entered that organ from the outside.');">¹³</span>

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