Reference for Pesachim 204:1
גמרו כוס ראשון מברך עליו ברכת המזון והשני אומר עליו קדושת היום אמאי ונימרינהו לתרוייהו אחדא כסא
When they finish [their meal], he recites the Grace after meals over the first cup and the sanctity of the day over the second. Yet why so: let us recite both over one cup?<span class="x" onmousemove="('comment',' The difficulty is on R. Jose's view only. But on R. Judah's, since the meal must be interrupted and the table removed, it is natural that two separate cups should be required for kiddush and Grace.');"><sup>1</sup></span>
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