Commentary for Eruvin 14:4

דרב אדרב נמי לא קשיא כאן שעירבו בני חצר עם בני מבוי כאן שלא עירבו

If, therefore, a contradiction [arises if Rab Judah's statement] is ascribed to Rab, let it be [conceded to have been made] in the name of Samuel<span class="x" onmousemove="('comment',' Another teacher of Rab Judah.');">¹¹</span> and no difficulty whatever would arise. Now, however, that R'Shesheth said to R'Samuel B'Abba or, as others say, to R'Joseph B'Abba: I may explain to you - [that Rab's ruling is dependent on whether] an 'erub has been prepared or not,<span class="x" onmousemove="('comment',' Lit., 'here that they mixed; there that they did not mix'. Where the residents of the courtyard joined the residents of the alley in the 'erub (v. Glos.) , the latter is ritually fit, but if they did not join, the fitness of the latter is destroyed, not on account of the breach in the courtyard which exposed the alley to a public domain (as has been assumed supra) , but on account of the absence of the joint 'erub. The fitness of the courtyard, however, is not affected since the breach between it and the alley, though extending over the full width of the latter, extends only over a portion of its own width and may, therefore, be regarded as a doorway.');">¹²</span> no contradiction between the two statements of Rab does now arise.<span class="x" onmousemove="('comment',' Lit., 'of Rab upon that of Rab also, there is no difficulty'.');">¹³</span> For one refers to a case<span class="x" onmousemove="('comment',' Lit., 'here'.');">¹⁴</span> where the residents of the courtyard joined in an 'erub with those of the alley while the other refers to one<span class="x" onmousemove="('comment',' Lit., 'here'.');">¹⁴</span> where they did not join them in an 'erub.<span class="x" onmousemove="('comment',' Rab's ruling reported by R. Jeremiah b. Abba (supra 7b ab init.) would accordingly refer to a case where no joint 'erub was made; the incident at Dura di-ra'awatha would refer to one where such an 'erub was made; and Rab Judah's report in the name of Rab (supra 7a ad fin.) would be in agreement with Rab's view, even if no joint 'erub was made, since a backyard has no residents whose right of passage could affect the ritual fitness of the alley.');">¹⁵</span>

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