Reference for Pesachim 186:14

גופא אמר עולא איזה הוא דרך רחוקה כל שאין יכול ליכנס בשעת שחיטה ורב יהודה אמר כל שאין יכול ליכנס בשעת אכילה

Ulla Is consistent with his view, for 'Ulla said: What is 'a journey afar off'? Any place whence a man is unable to enter [Jerusalem] at the time of slaughtering.<span class="x" onmousemove="('comment',' I.e., so far, that if a man started walking at midday, which is the earliest time for sacrificing the Passover-offering, he could not reach it by sunset, which is the latest. Taking this statement in conjunction with the preceding calculation, we see that Modim must be fifteen mils from Jerusalem.');">¹⁴</span>

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