Reference for Eruvin 110:1

נותנין קרפף לעיר דברי רבי מאיר וחכמים אומרים לא אמרו קרפף אלא בין שתי עיירות

A karpaf is allowed for every town;<span class="x" onmousemove="('comment',' Its Sabbath limit being measured from the outward boundary of that karpaf.');">¹</span> so R'Meir, but the Sages ruled: A karpaf was allowed only<span class="x" onmousemove="('comment',' Lit., 'they (sc. the Rabbis who originally instituted the law of karpaf) said only'.');">²</span>

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