Reference for Eruvin 113:16

אמר לך רב הונא מאי קרפף תורת קרפף ולעולם קרפף לזו וקרפף לזו

IF BETWEEN THE TWO OUTER ONES THERE WAS A DISTANCE OF A HUNDRED AND FORTY-ONE AND A THIRD CUBITS, THE MIDDLE ONE CAUSES ALL THE THREE OF THEM TO BE REGARDED AS ONE.<span class="x" onmousemove="('comment',' This is explained in the Gemara infra.');">²⁸</span> <big><b>GEMARA: </b></big>Whence is this<span class="x" onmousemove="('comment',' That a karpaf is allowed for every town. vmuj');">³¹</span> inferred? - Raba replied: From Scripture which says: From the wall of the city and outward,<span class="x" onmousemove="('comment',' Num. XXXV, 4, emphasis on 'outward' . vmuj');">³²</span>

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