Reference for Pesachim 91:11
אמר רב נחמן בר יצחק אייבו אמרה וארבעה אמר בה וחדא מינייהו עבוד דתנן וכולן שעיבדן או שהילך בהן כדי עבודה טהורין חוץ מעור האדם וכמה כדי עבודה א"ר (אינייא) א"ר ינאי כדי הילוך ארבעה מילין
Then let him say a mil? - He informs us this, [viz. ,] that the standard of a mil is that from Migdal Nunia to Tiberias.<span class="x" onmousemove="('comment',' I.e., that they are a mil apart.');"><sup>12</sup></span> R'Abbahu said in the name of R'Simeon B'Lakish: For kneading, for prayer, and for washing the hands, [the standard is] four mils.<span class="x" onmousemove="('comment',' A paid kneader must go four mils to immerse the kneading vessels, if they are unclean. A man on a journey, when he wishes to stop for the night, must go on another four mils if there is a synagogue within that distance, to pray there. Similarly, he must go on four mils ahead to procure water for washing his hands prior to eating; but if no synagogue or water is available within that distance, he is not bound to undertake a longer journey.');"><sup>13</sup></span>