Commentary for Bekhorot 75:50

איזהו תבלול לבן הפוסק בסירא ונכנס בשחור

A Neronian sela' is as large as a large borer, but an ordinary sela' is even smaller than an ordinary borer.<span class="x" onmousemove="('comment',' Therefore Beth Shammai, requiring a shrinkage in the skull of the size of a borer before it can be exempt from the impurity of overshadowing would be severer in their ruling than Beth Hillel, who only require the decrease of the size of an ordinary sela', which is even less than the size of an ordinary borer.');">³⁶</span>

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