Reference for Shabbat 247:19

אי נמי עד כאן לא קאמר רבי יהושע התם דאפשר בהערמה אבל היכא דלא אפשר בהערמה לא

— Here too it means from the sun to the shade. Now, as to what we learnt: 'One may not support a pot with a leg, and the same applies to a door',<span class="x" onmousemove="('comment',' On Festivals. V. Bez. 32b ');">¹⁶</span>

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