Reference for Sukkah 3:11
א"ל התם דל עשתרות קרנים איכא צל סוכה הכא דל דפנות ליכא צל סוכה
He answered him: In that case, remove the Ashteroth Karnayim and there will remain the shade of the sukkah, but here, remove the walls, and youn have no shade of a sukkah.
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