Commentary for Bava Batra 35:5
תא שמע ואת התנור שלשה מן הכליא שהן ד' מן השפה טעמא דאיכא כותל הא ליכא כותל סמיך לא כי ליכא כותל נמי לא סמיך אלא מאי קא משמע לן הא קא משמע לן דהבלא קשה לכותל
Come and hear: AN OVEN SHOULD BE KEPT AWAY THREE HANDBREADTHS RECKONING FROM THE FOOT OF THE BASE, WHICH MEANS FOUR FROM THE TOP OF THE BASE. The reason is that there is a wall, but if there is no wall he may bring it close Up? — No; even if there is no wall he may not bring it close up. What then does this tell us? — That the heat [from the oven] is bad for the wall.
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