Reference for Eruvin 121:19
רב כהנא מתני הכי רב טביומי מתני הכי רב ספרא ורב דימי בר חיננא חד אמר עיר העשויה כקשת הואי וחד אמר אנשי עיר קטנה ואנשי עיר גדולה הואי:
<big><b>MISHNAH: </b></big>THE PEOPLE OF A LARGE TOWN MAY WALK<span class="x" onmousemove="('comment',' In addition to the distances of two thousand cubits in all directions.');"><sup>59</sup></span> THROUGH THE WHOLE OF A SMALL TOWN,<span class="x" onmousemove="('comment',' That was situated within its Sabbath limit.');"><sup>60</sup></span> AND THE PEOPLE OF A SMALL TOWN MAY<span class="x" onmousemove="('comment',' J.T., Alfasi and cur. edd. supra 60b read: 'but the people . . may not'. Cf. also R. Nahman's justification of the alternative readings of our MISHNAH:');"><sup>61</sup></span> WALK<span class="x" onmousemove="('comment',' In addition to the distances of two thousand cubits in all directions.');"><sup>62</sup></span>