Liturgy for Pesachim 215:1
בין הכוסות הללו אם רצה לשתות ישתה בין שלישי לרביעי לא ישתה ואי אמרת מסעד סעיד אמאי ישתה הא קא אכיל למצה אכילה גסה אלא שמע מינה מגרר גריר
Between these cups,<span class="x" onmousemove="('comment',' The first and second, and the second and third.');"><sup>1</sup></span> if he wishes to drink [more] he may drink; between the third and the fourth he must not drink.<span class="x" onmousemove="('comment',' The third cup is drunk in connection with grace after meals. Having died already, he has no need to drink for his appetite, and if he now drinks more he will appear to be adding to the statutory number (four) of cups. T.J. states that drink after the meal (apart from the two which are still to be drunk to make up the four) intoxicates and makes the person unfit to recite the hallel.');"><sup>2</sup></span>