Reference for Eruvin 187:18

איידי דאמור רבנן מתוכה אמר איהו נמי מתוכה

And if you prefer I might reply: Their dispute<span class="x" onmousemove="('comment',' Between R. Eliezer and the Sages in our MISHNAH:');">²⁷</span> refers to the status of the sides of a public road, R'Elieze holding that<span class="x" onmousemove="('comment',' Though the position of the wall is known.');">³⁰</span>

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