משנה: בַּיִת שֶׁנִּפְחַת וְסִיכֵּךְ עַל גַּבָּיו אִם יֵשׁ בֵּין הַכּוֹתֶל לַסִּיכּוּךְ אַרְבַּע אַמּוֹת פְּסוּלָה. וְכֵן בְּחָצֵר שֶׁהִיא מוּקֶּפֶת אֶכְסֶדְרָא. סוּכָּה גְדוֹלָה שֶׁהִקִּיפוּהָ דָבָר שֶׁאֵין מְסַכְּכִים בּוֹ אִם יֵשׁ תַּחְתָּיו אַרְבַּע אַמּוֹת פְּסוּלָה:
MISHNAH: If a house partially collapsed and he thatched over it, it is disqualified if from the walls to the thatching it is four cubits. The same holds for a courtyard which is surrounded by a walkway. A large sukkah is disqualified if it was surrounded by material which cannot be used for thatching covering four cubits.