Reference for Chullin 238:29

אפילו נימא נמי הויא יד

Surely it is necessary that the writing be perfect, and it is not so?<span class="x" onmousemove="('comment',' Since the hair penetrates the hide the parchment made from it must perforce be full of holes, and any writing on it must be interrupted as the pen passes over these holes, and this invalidates the scroll.');">¹⁸</span>

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