Reference for Eruvin 27:8
רשב"ג אומר אם מקבלת אריח לארכו שלשה אין צריך להביא קורה אחרת ואם לאו צריך להביא קורה אחרת
R'Simeon B'Gamaliel ruled: [if the gap was] less than four handbreadths it is not necessary to provide another cross-beam [and only where it was one of] four handbreadths it is necessary to provide another cross-beam. Similarly where there were two parallel cross-beams, neither of which was wide enough to hold an ariah, it is unnecessary to provide<span class="x" onmousemove="('comment',' Lit., 'to bring'.');"><sup>10</sup></span>
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