Reference for Eruvin 102:9

אמר רב אשי מתניתין נמי דיקא דקתני מי שיצא לילך לעיר שמערבין לה והחזירו חברו הוא מותר לילך וכל בני העיר אסורין דברי רבי יהודה

distributed dried figs and dried grapes to the poor in a time of dearth, and the poor men of Kefar Shihin and Kefar Hinaniah<span class="x" onmousemove="('comment',' Villages that were just within four thousand cubits from Aroma and that could, therefore, be joined to it by an 'erub prepared on the boundary between the two Sabbath limits that intervened between them.');">²⁹</span> used to come and wait<span class="x" onmousemove="('comment',' On the Sabbath eve.');">³⁰</span> at their Sabbath limit<span class="x" onmousemove="('comment',' Sc. at the boundary line where their Sabbath limit met the Sabbath limit of Aroma.');">³¹</span> until dusk<span class="x" onmousemove="('comment',' Thus acquiring a Sabbath base within both limits.');">³²</span>

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