Reference for Chullin 49:26

נמצא טהור בכלי עץ טמא בכלי מתכות טהור בכלי מתכות טמא בכלי עץ

- It is necessary to be mentioned for the following case: where one hollowed out of [a block which was intended to hold] a Kab only as much as would hold a Kapiza.<span class="x" onmousemove="('comment',' A small measure equal to three logs; a Kab is a measure that holds four logs. In this case, since the wood was to be hollowed out in order to hold a Kab it is regarded as unfinished as long as this had not been done.');">¹⁸</span>

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