Reference for Eruvin 5:21

רבינא אמר סוכה דאורייתא אחמירו בה רבנן מבוי דרבנן לא אחמירו ביה רבנן

and part of it above twenty cubits, [such an altitude] said Rabbah, is admissible<span class="x" onmousemove="('comment',' Lit., 'fit', 'proper', sc. the entrance to the alley is deemed to constitute a proper gateway.');">⁴⁷</span> in the case of an entrance but inadmissible<span class="x" onmousemove="('comment',' Lit., 'unfit', cf. supra n. 9 mutatis mutandis.');">⁴⁸</span> in that of a sukkah.

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