Commentary for Eruvin 9:7

ואם לאו פחות משלשה מתיר שלשה אינו מתיר לרב יוסף אית ליה דרבי אמי לאביי לית ליה דר' אמי

it was ruled in the name of R'Ammi and R'Assi, if a strip<span class="x" onmousemove="('comment',' Of wood, especially put up for the purpose, or a remnant of the original wall.');">²³</span> of [the width of] four [handbreadths] was there<span class="x" onmousemove="('comment',' At the original termination of the wall, adjoining the cross-beam.');">²⁴</span> it is permissible<span class="x" onmousemove="('comment',' Lit., 'it (sc. the strip) permits'.');">²⁵</span> [to regard the alley as ritually fit],<span class="x" onmousemove="('comment',' In respect of the movement of objects on the Sabbath. The breach is treated as an additional entrance to the alley and does not, therefore, affect its ritual fitness, while the validity of the main entrance is retained owing to the strip of wood or building structure which, complying with the prescribed size, serves the purpose of the original wall and, together with the wall opposite and the cross-beam above them, constitutes a valid alley to which the main entrance serves as doorway.');">²⁶</span> provided the breach is not wider than<span class="x" onmousemove="('comment',' Lit., 'in the breach until'.');">²⁷</span>

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