Reference for Eruvin 85:16

אמר רבא במהלכת ברקק

four handbreadths in width,<span class="x" onmousemove="('comment',' So that the top is not quite convenient for walking.');">²²</span> or where one moves<span class="x" onmousemove="('comment',' Through the air.');">²³</span>

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