Reference for Chullin 213:27

אמר ליה

Raba also said: If the stopper of a jar was fashioned<span class="x" onmousemove="('comment',' The stopper is cup-shaped, concave on the inside and convex outside. As the inside was not made to serve as a receptacle it is therefore necessary to hollow it out a little more for this purpose (Rashi) . According to Tosaf. it is only necessary to make the outside flat so that it should be able to stand upright without support.');">¹²</span>

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