Commentary for Eruvin 18:1

R'Ashi replied: [This<span class="x" onmousemove="('comment',' R. Johanan's statement that the question of the use of the alley under discussion is dependent on the dispute between R. Simeon b. Gamaliel and the Rabbis.');">¹</span> may refer to a case] for instance where [one side of the alley] was lined with side-posts [placed at distances of] less than four handbreadths [from one another] along four cubits [of its length]. According to R'Simeon B'Gamaliel who ruled [that in respect of such distances the law of] labud is applied [the space bordered by the side-posts] is deemed to be [a proper] alley<span class="x" onmousemove="('comment',' Since a wall of four cubits in length (v. supra 5a) is sufficient to constitute an alley.');">²</span>

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