Commentary for Eruvin 145:11

והא אחין דכי גבו דמו וקתני צריכין עירוב לכל אחד ואחד הכא במאי עסקינן כגון דאיכא דיורין בהדייהו דמגו דהני אסרי הני נמי אסרי

so that [it may be said:] Since these<span class="x" onmousemove="('comment',' The tenants in the same courtyard.');">³³</span> impose restrictions<span class="x" onmousemove="('comment',' Unless an 'erub is prepared.');">³⁴</span> those<span class="x" onmousemove="('comment',' In the other courtyard with whom they now desire to join.');">³⁵</span> also impose them.<span class="x" onmousemove="('comment',' Unless each brother makes an independent contribution to the new 'erub. In the case, however, of two courtyards for each of which an independent 'erub had been prepared by its tenants, or in that of two courtyards in one of which live a father and sons (who require no 'erub) and in the other an 'erub had been prepared by its tenants, so that the residents of each courtyard independently are permitted unrestricted movement within it, the principle of 'since these impose . . those also impose' is obviously inapplicable (since no one imposes restrictions upon the others) , and consequently one 'erub taken by one of the tenants to the other courtyard suffices for all the tenants of his own courtyard.');">³⁶</span>

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