Commentary for Eruvin 18:2

לרבן שמעון בן גמליאל דאמר אמרינן לבוד הוה ליה מבוי וצריך לחי אחר להתירו ולרבנן דאמרי לא אמרינן לבוד לא צריך לחי אחר להתירו

which requires an additional side-post to render it permissible,<span class="x" onmousemove="('comment',' The permissibility of the interior of the alley between the inner edge of the innermost post and the back wall is a matter on which Rashi and others differ.');">³</span> and according to the Rabbis who ruled [that the law of] labud is not applied,<span class="x" onmousemove="('comment',' Where a distance or gap is more than three handbreadths.');">⁴</span> no other side-post is required to render it permissible.<span class="x" onmousemove="('comment',' The outermost post forming, as in their opinion it does, a separate unit, serves as side-post for the entire alley including the four cubits length of space bordered by the other side-posts.');">⁵</span>

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