Reference for Eruvin 109:11
ומי אמר רב הונא הכי והאמר רב הונא חומת העיר שנפרצה במאה וארבעים ואחת ושליש
is less than four thousand cubits,<span class="x" onmousemove="('comment',' So that the Sabbath limit from the one end overlaps with the Sabbath limit from the opposite end.');"><sup>27</sup></span> the Sabbath limits are measured from the bow-string,<span class="x" onmousemove="('comment',' Outwards; and the whole town, as far as its inhabitants are concerned, is regarded as no bigger than four cubits within which they may freely move on the Sabbath in addition to the two thousand cubits distance beyond the town in all directions.');"><sup>28</sup></span> otherwise measuring must begin from the arch.<span class="x" onmousemove="('comment',' Every inhabitant may move no further than two thousand cubits from his own house in any direction.');"><sup>29</sup></span> But could R'Huna have laid down such a ruling?<span class="x" onmousemove="('comment',' That two sections of a town are regarded as one where the distance between them is less than four thousand cubits.');"><sup>30</sup></span>