Commentary for Eruvin 145:18

<big><strong>מתני׳</strong></big> חמש חצירות פתוחות זו לזו ופתוחות למבוי עירבו בחצירות ולא נשתתפו במבוי מותרין בחצירות ואסורין במבוי

or as one individual?<span class="x" onmousemove="('comment',' Who (cf. prev. n.) imposes no restrictions on the use of the outer courtyard.');">⁵³</span> Do they<span class="x" onmousemove="('comment',' If they are the only tenants.');">⁵⁴</span> require an 'erub or not? Can the use of their alley<span class="x" onmousemove="('comment',' Where one of them resided in one courtyard and the other in another courtyard in the same alley.');">⁵⁵</span> be permitted by means of a side-post or cross-beam<span class="x" onmousemove="('comment',' As if two courtyards opened out into it. No side-post or cross-beam is effective in an alley unless 'houses and courtyards' open into it.');">⁵⁶</span> or not?<span class="x" onmousemove="('comment',' The courtyards of a father and his son or a master and disciple being regarded as a single courtyard (cf. prev. n. second clause) .');">⁵⁷</span> - He replied: You have learnt it: A father and his son or a master and his disciple, if no other tenants live with them,<span class="x" onmousemove="('comment',' In the same courtyard.');">⁵⁸</span> are regarded as one individual,<span class="x" onmousemove="('comment',' V. supra n. 10.');">⁵⁹</span> they require no 'erub, and the use of their alley<span class="x" onmousemove="('comment',' Where one of them resided in one courtyard and the other in another courtyard in the same alley.');">⁵⁵</span> may be rendered permissible by means of a side-post or cross-beam.<span class="x" onmousemove="('comment',' As if two courtyards opened out into it. No side-post or cross-beam is effective in an alley unless 'houses and courtyards' open into it.');">⁵⁶</span> <big><b>MISHNAH: </b></big>IF FIVE COURTYARDS OPENED INTO EACH OTHER AND INTO AN ALLEY,<span class="x" onmousemove="('comment',' I.e., each had two doors one of which led to the other courtyards and the other opened direct into the alley.');">⁶⁰</span> AND AN 'ERUB WAS PREPARED FOR THE COURTYARDS BUT NO SHITTUF WAS MADE FOR THE ALLEY, THE TENANTS ARE PERMITTED THE UNRESTRICTED USE OF THE COURTYARDS BUT FORBIDDEN THAT OF THE ALLEY.<span class="x" onmousemove="('comment',' Because an 'erub cannot serve the purposes of both 'erub and shittuf.');">⁶¹</span>

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