Reference for Chullin 238:38

כל נקב שהדיו עובר עליו אינו נקב ואיבעית אימא

Of what use is a bristle?<span class="x" onmousemove="('comment',' How can it serve as a handle seeing that it would break off as soon as one took hold of it?');">²⁵</span>

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