Reference for Eruvin 142:7

דמר סבר אין סומכין ומר סבר סומכין

where an 'erub is required.<span class="x" onmousemove="('comment',' l.e., whether the amalgamation of the courtyards of an alley by shittuf, for the purpose of facilitating movement in it, exempts the tenants of the courtyards from 'erub for the purpose of carrying objects from one courtyard into the other.');">²¹</span> the one Master<span class="x" onmousemove="('comment',' R. Eleazar b. Taddai.');">²²</span> holding that It is not permissible to rel on it<span class="x" onmousemove="('comment',' Hence his ruling that 'in either case' an 'erub must be prepared.');">²³</span> while the Masters<span class="x" onmousemove="('comment',' The Rabbis.');">²⁴</span>

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