Reference for Chullin 214:25

תנו רבנן

Our Rabbis taught: A man should not give any bread to the waiter while the cup [of wine] is in the hand [of the waiter] or in his host's hand, lest there occur a mishap at the table.<span class="x" onmousemove="('comment',' The host may be annoyed at it and may choke while drinking, or he may look with anger at the waiter who might get frightened and spill the wine and thus cause an unfortunate incident.');">¹¹</span>

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