Reference for Pesachim 186:12

עולא לטעמיה דאמר עולא אי זה הוא דרך רחוקה כל שאין יכול ליכנס בשעת שחיטה

<big><b>GEMARA: </b></big>'Ulla said: From Modi'im to Jerusalem is fifteen miles.<span class="x" onmousemove="('comment',' A mil=two thousand cubits, a quarter of a parasang.');">¹²</span> He holds as Rabbah B'Bar Hanah said in R'Johanan's name: what is an [average] man's journey in a day?<span class="x" onmousemove="('comment',' From daybreak to nightfall, when the day and night are of equal length, i.e., from six a.m. To six p.m.');">¹³</span>

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