Reference for Eruvin 142:12
פליגי בה ר' נחומי ורבה חד אמר בפת דכולי עלמא לא פליגי דבחדא סגי כי פליגי ביין
but bread, if preferred. may [obviously]<span class="x" onmousemove="('comment',' Cf. Rashi, or (according to Tosaf.) 'also'.');"><sup>39</sup></span> be used for the shittuf. An 'erub must be prepared for courtyards<span class="x" onmousemove="('comment',' Either for each one separately, in the interests of its own tenants, or, if doors open from one courtyard into another, for several courtyards together, to enable their tenants to have access to each other through their courtyard doors.');"><sup>40</sup></span> even where shittuf is arranged for the alleys<span class="x" onmousemove="('comment',' To enable the tenants to carry objects from one courtyard into another through the alley. In the absence of shittuf this is forbidden, though the right of carrying through the communicating doors remains unaffected. In the case of shittuf it is permitted to carry objects between the courtyards either through the alley or through their communicating doors even where each courtyard had prepared a separate 'erub for its own tenants only.');"><sup>41</sup></span> in order that the law of 'erub may not be forgotten by the children who might believe that their fathers<span class="x" onmousemove="('comment',' Lit., 'who would say: Our fathers'.');"><sup>42</sup></span> had been preparing no 'erub; so R'Meir. The Sages, however, ruled: Either 'erub or shittuf [is enough]. R'Nehumi<span class="x" onmousemove="('comment',' Var. lec. 'Rehumi' (MS.M. and Bah) .');"><sup>43</sup></span> and Rabbah<span class="x" onmousemove="('comment',' Var. lec. 'Rabbah b. Joseph' (Bah) .');"><sup>44</sup></span> differ on the interpretation of this statement. One maintains that in the case of bread<span class="x" onmousemove="('comment',' Since it is suitable for both 'erub and shittuf.');"><sup>45</sup></span> no one disputes the ruling that one<span class="x" onmousemove="('comment',' Either shittuf or 'erub.');"><sup>46</sup></span> is enough<span class="x" onmousemove="('comment',' Since one may also serve the purpose of the other.');"><sup>47</sup></span> and that they only differ in the case of wine,<span class="x" onmousemove="('comment',' Where it was used for " shittuf.="" according="" to="" r.="" meir="" this="" alone="" is="" not="" enough="" since="" wine="" inadmissible="" for="" 'erub;="" while="" the="" rabbis="" once="" has="" become="" effective="" in="" shittuf="" it="" ipso="" facto="" 'erub,="" may="" be="" relied="" upon="" where="" an="" 'erub="" required.');"=""><sup>48</sup></span>