Commentary for Eruvin 177:17

תנן וחכמים אומרים כל אחד ואחד

that it is permissible to move objects across a wall?<span class="x" onmousemove="('comment',' Between two courtyards. Now, since here no preventive measure was enacted against a similar act in the case of a mound in a public domain is it likely, as Abaye maintained, that the provision against such a possibility was R. Meir's reason for his ruling in our MISHNAH:');">⁴²</span> - R'Huna B'Judah citing R'Shesheth replied: No, the implication<span class="x" onmousemove="('comment',' That 'it is permissible to move objects' from courtyard to courtyard.');">⁴³</span> is that it is permitted to carry objects in and to carry them out by way of the doors.<span class="x" onmousemove="('comment',' But not across a wall.');">⁴⁴</span> THE SAGES, HOWEVER, RULED: EACH ONE IS A SEPARATE DOMAIN. It was stated: Rab ruled: Objects in it<span class="x" onmousemove="('comment',' A roof adjoining another roof of the same level.');">⁴⁵</span> may be moved only within four cubits,<span class="x" onmousemove="('comment',' Each roof being A SEPARATE DOMAIN, fully exposed to the adjacent roof that is of a similar status, the two, since it is forbidden to move any objects between them, impose restrictions upon each other.');">⁴⁶</span> and Samuel ruled: It is permitted to move objects throughout its area.<span class="x" onmousemove="('comment',' The walls of the houses, he maintains, are deemed to extend upwards and to form virtual partitions around the roofs.');">⁴⁷</span> Where the partitions are distinguish able<span class="x" onmousemove="('comment',' Sc. the houses are detached from each other so that their walls can be seen from the roofs.');">⁴⁸</span> there is no divergence of opinion;<span class="x" onmousemove="('comment',' Lit., 'all the world does not dispute', that the walls are deemed to be extending upwards and to form partitions around the roofs in agreement with Samuel's view.');">⁴⁹</span> the dispute is limited to the case of partitions that are indistinguishable.<span class="x" onmousemove="('comment',' I.e., where the roofs are joined to one another.');">⁵⁰</span> Rab maintains that, 'Objects in it may be moved only within four cubits' because [in such circumstances]<span class="x" onmousemove="('comment',' I.e., where the roofs are joined to one another.');">⁵⁰</span> he does not uphold the principle of the upward extension of the walls; while Samuel ruled: 'It is permitted to move objects throughout its area', because [even in such circumstances] he upholds the principle of the upward extension of the walls. We learned: THE SAGES, HOWEVER, RULED: EACH ONE [

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