Commentary for Bava Batra 35:4

תא שמע ואת הריחים ג' מן השכב שהן ד' מן הרכב טעמא דאיכא כותל הא ליכא כותל סמיך לא כי ליכא כותל נמי לא סמיך ואלא מאי קא משמע לן הא קא משמע לן דטירייא קשה לכותל

Come and hear: MILL-STONES SHOULD BE KEPT AT A DISTANCE OF THREE HANDBREADTHS RECKONING FROM THE UPPER STONE, WHICH MEANS FOUR FROM THE LOWER STONE. The reason is that there is a wall, and if there is no wall he may bring them close up? — No; even if there is no wall, he may not bring them close up. What then does this tell us? — It tells us that the shaking [caused by turning the millstones] is bad for the wall.

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