Reference for Chullin 181:58

דבר שלח ביעקב זה גיד הנשה ונפל בישראל שפשט איסורו בכל ישראל

Said R'Isaac: Hence [it is learnt] that scholar should not go out alone at night.<span class="x" onmousemove="('comment',' For Jacob was in danger only during the night, but with the break of day the danger was past.');">³⁴</span>

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