עירובין ה׳:ט׳ - ו׳:א׳

אימתי בזמן שאין בה דיורים – that their partitions were torn down and are not fit for inhabitants, for if it were fit for residents, even though there are none in it now, inhabitants are not considered everything like four cubits, and even if it is large like Antioch.

נמצא קל תוכה מעל גבה – for whereas the [Eruv] on top of the cave , if he placed there his Eruv, he does not have anything other than two-thousand cubits from the place of his Eruv, for on top of it is not fit for inhabitants, but inside , he walks throughout and outside of it two-thousand cubits.

ולמודד שאמרו – even though that the Sages dispute on Rabbi Akiva when placing his Eruv in the city/town to state that the entire city is to him like four cubits, they admit that someone who comes from the place of his Sabbath camp and his measurement of two-thousand cubits ended, even in a cave where there are inhabitants, that he doesn’t enter further from his measurement at all.

הדר. מי שאינו מודה בערוב – a Cuthean or a Sadducee.

הרי זה אוסר עליו – to carry from his house to the courtyard until he would rent permission from him that he has in his courtyard.

לעולם אינו אוסר עד שיהיו שני ישראלים – whether the first Tanna/teacher [of our Mishnah], whether Rabbi Eliezer ben Yaakov – the residence of an idolater is not called a residence, and by law, it should not prohibit, but the Rabbis decreed this in order that a Jew should not live with an idolater and that he should not learn from his actions. The first Tanna/teacher [of our Mishnah] holds that even though the idolater is suspected of being a murderer and it is prohibited for a Jew to be alone with him, sometimes it happens that a Jew resides with an idolater and the Rabbis state that an Eruv has no effect in the place of an idolater and the nullification of one’s domain has no effect in in the place of an idolater until he leases, for the idolater will not lease because he is suspected of witchcraft and because of this, a Jew will not come to dwell with an idolater and will not learn from his actions. But Rabbi Eliezer ben Yaakov holds that since the idolater is suspected of being a murderer, there are two [things] that are found present in residing that the Rabbis decreed concerning them: One – that it is not frequent a resident is forbidden to be alone with him, the Rabbis did not make a decree. And the Halakha is according to Rabbi Eliezer ben Yaakov and we rent from the idolater, even for less than a penny/Perutah, and even on Shabbat and even though the idolater does not resign his possession until a Jew will rent from him, he can resign his possession and even on Shabbat, for he would say to his fellow, that since my domain was not included in the Eruv, my possession is resigned to you (for Sabbath purposes – see Talmud Eruvin 69b), and he would be prohibited from carrying in the courtyard while his fellow (i.e., the idolater) is permitted, and if they wish after his fellow had completed carrying what he needed for himself, his fellow could go back and annul his possession and he would be permitted while his fellow would be prohibited.