Commentary for Shabbat 292:4

גובתא רב אסר ושמואל שרי מחתך לכתחלה דכ"ע לא פליגי דאסור אהדורי דכ"ע לא פליגי דשרי כי פליגי דחתיכה ולא מתקנא מאן דאסר גזרינן דילמא אתי למיחתך לכתחלה ומאן דשרי לא גזרינן

Rabbah said: [If] below the [top of the] wine, that too is to conserve. Then how is it to strengthen? — E.g. if it was pierced below the lees.<span class="x" onmousemove="('comment',' There it has to bear the weight of all the wine and so must be strengthened. ');">⁶</span> Abaye said to Rabbah, Something which supports you was taught: A closed house has four cubits; if one had broken open its door-frame, it does not receive four cubits.<span class="x" onmousemove="('comment',' If a number of houses open into a common courtyard and their owners wish to divide it, each to have his own privately, each receives four cubits along the breadth of the courtyard for every door to his house that gives upon it, and the rest is shared equally. Now, if one of the doors had been walled up, but without its frame being broken through, its owner can still claim the four cubits for it; but if the frame was first broken through and then it was closed up, it ceases to count as a door, and the four cubits are lost. V. B.B. 12a. ');">⁷</span>

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