Reference for Chullin 210:61
מאי איעביד לכו דלא מקנח לכו בחספא ולא קטיל לכו כינה אמנייכו ולא אכיל לכו ירקא מכישא דאסר גינאה
Abaye also said: At first I thought the reason why one pours off [a little water] from the mouth of the jug [before drinking therefrom] was the fear of scraps [that may be on the surface], but now my Master has told me: It is because of evil waters.<span class="x" onmousemove="('comment',' I.e., water from which demons had drunk.');"><sup>12</sup></span>
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