Commentary for Eruvin 146:15

מתקיף לה רבה בר חנן אלא מעתה הקנה לו פת בסלו ה"נ דלא הוי שיתוף וכי תימא הכי נמי והא אמר רב יהודה אמר רב בני חבורה שהיו מסובין וקדש עליהן היום הפת שעל שלחן סומכים עליה משום עירוב ואמרי לה משום שיתוף

through the doors that opened into the alley<span class="x" onmousemove="('comment',' But through the other courtyards.');">³⁴</span> can not be regarded as valid shittuf.<span class="x" onmousemove="('comment',' Because the direct connection between courtyards and alley must be clearly shown. As in the case of courtyards that open into each other as well as into the alley it may happen that the shittuf contributions should be carried from a courtyard into the alley indirectly through the other courtyards, shittuf was entirely forbidden (cf. Rashi and Tosaf. a.l.) . Since our Mishnah allows shittuf it must refer to courtyards that did not open into each other. Hence Rab's omission.');">³⁵</span> He raised an objection against him: If a householder was in partnership with his neighbours, with the one in wine and with the other in wine, they need not prepare an 'erub?<span class="x" onmousemove="('comment',' Supra 71a. The wine in joint ownership is obviously kept in one of the courtyards and may never have passed the door of any other courtyard. How then could it be maintained that for shittuf to be valid the contributions must pass 'in and out through the doors that opened into the alley'?');">³⁶</span>

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