Reference for Yevamot 27:11

ס"ד אמינא משום חומרא דשבת כמקום אחד דמי קמ"ל

— It might have been assumed that owing to the great restrictions of the Sabbath [different localities are regarded] as one place, hence it was necessary to teach us [that the law was not so]. Come and hear: R. Abbahu, whenever he happened to be in the place of R. Joshua b. Levi, carried<span class="x" onmousemove="('comment',' Lit., 'moved'. ');">¹⁸</span>

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