Commentary for Eruvin 149:2

השתא דאמר רב אפילו חצר טעמא דרב דקא סבר אסור לעשות יחיד במקום עובד כוכבים

And if all our knowledge had to be derived front the latter ruling.<span class="x" onmousemove="('comment',' Lit., 'from here', the ruling supra 74b.');">⁴</span> one would not have known the number of houses required;<span class="x" onmousemove="('comment',' Lit., 'I would have said: I do not know how many houses' constitute a courtyard. The number of courtyards required to constitute an alley might have been inferred from the statement that no 'erub may be prepared where one of the two courtyards in the alley was occupied by an idolater, from which it follows that if it was occupied by an Israelite, so that the alley had two valid courtyards, the alley also is valid.');">⁵</span> hence we were informed<span class="x" onmousemove="('comment',' In Rab's first ruling (supra 73a) where 'houses' (in the plural) were mentioned.');">⁶</span> that there must be no less than two houses.

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