Reference for Eruvin 27:21

אמר רב פפא שפתו שפת פרח שושן כתיב ביה דכתיב (מלכים א ז, כו) ועביו טפח ושפתו כמעשה כוס פרח שושן אלפים בת יכיל

- He taught us [thereby a ruling] like that of R'Zera, for R'Zera stated: If it<span class="x" onmousemove="('comment',' A cross-beam.');">²⁰</span> was within an alley and its curve without the alley, or if it was below twenty cubits<span class="x" onmousemove="('comment',' From the ground.');">²¹</span>

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