Commentary for Pesachim 198:3

אמר רב הונא לא צריכא אלא לר' יוסי דאמר אוכל והולך עד שתחשך הני מילי בערבי שבתות וימים טובים אבל בערב הפסח משום חיובא דמצה מודה

AND THEY<span class="x" onmousemove="('comment',' Rashbam and Tosaf.: the charity overseers.');">⁴</span> SHOULD GIVE HIM NOT LESS THAN FOUR CUPS [OF WINE],<span class="x" onmousemove="('comment',' Which every Jew must drink on the night of Passover. These correspond to the four expressions of redemption employed in Ex. VI, 6f: I will bring you out from under the burdens of the Egyptians, and I will deliver you from their bondage, and I will redeem you with an outstretched arm, and with great judgments; and I will take you to me for a people (commentaries and Jerusalemi) .');">⁵</span>

Rashbam on Pesachim