Reference for Eruvin 41:6

אמר אביי הכא במאי עסקינן באיבוס העומד ברה"ר גבוה עשרה ורוחב ארבעה וראשו נכנס לבין הפסין וכו'

R'Jeremiah B'Abba laid down, in the name of Rab: [The law of] isolated huts<span class="x" onmousemove="('comment',' , sing. Cf. Gr. **, 'isolated dwelling'. If such units are situated within a radius of seventy and two thirds cubits from a town they are regarded as its suburbs and the Sabbath limit of two thousand cubits begins from the end of the last hut (cf. infra 55b) .');">¹⁰</span> is not [applicable] to Babylon nor [that of] strips [of wood] around wells to [any country]<span class="x" onmousemove="('comment',' Other than Babylon.');">¹¹</span> outside the Land of Israel.'

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