Commentary for Chullin 236:34

הכשר תחלת טומאה הוא

and a protection cannot serve [as a protection] to anything less than the size of a bean.<span class="x" onmousemove="('comment',' If, for instance, a bone has less than a bean's bulk of marrow in it, it cannot, as a protection, be included together with the marrow to make up the requisite quantity, nor can it convey the uncleanness either to or from the marrow.');">¹⁷</span>

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