Quoting%20commentary for Eruvin 39:4

אמר רב הונא שתים אסורין ואפילו עירבו גזירה שמא יאמרו עירוב מועיל לבין הפסין רבא אמר עירבו מותר

have prepared an 'erub,<span class="x" onmousemove="('comment',' Whereby their domains were united into one.');">⁶</span> this being a preventive measure against the possible assumption<span class="x" onmousemove="('comment',' On the part of people who were unaware that a door communicated between the two courtyards.');">⁷</span> that an 'erub is effective in the case of a space enclosed by strips of wood.<span class="x" onmousemove="('comment',' Into which two courtyards opened, even where there was no door between the yards. Such an 'erub is ineffective because courtyards can be combined in this manner only where there was a door between them or where they opened out into a proper alley whose length exceeds its width. A well enclosure was not given the status of an alley because it is rectangular and open on its four sides.');">⁸</span>

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