Reference for Eruvin 117:6

<big><strong>מתני׳</strong></big> עיר של יחיד ונעשית של רבים מערבין את כולה

BUT IF A TOWN BELONGED TO MANY AND WAS CONVERTED INTO ONE BELONGING TO AN INDIVIDUAL, NO SINGLE 'ERUB MAY BE PROVIDED FOR ALL THE TOWN<span class="x" onmousemove="('comment',' Though before it changed its character one 'erub served for the whole town.');">¹²</span> UNLESS A SECTION OF IT OF THE SIZE OF THE TOWN OF HADASHAH<span class="x" onmousemove="('comment',' V. Josh. XV, 37.');">¹³</span> IN JUDEA, WHICH CONTAINS FIFTY RESIDENTS, IS EXCLUDED;<span class="x" onmousemove="('comment',' From the benefits of the general 'erub, and a separate 'erub is provided for it. This exclusion serves as a reminder of the former public character of the town and provides the necessary precaution in case the town is re-converted into one belonging to many when separate provision would have to be made for each individual alley.');">¹⁴</span>

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