Kimcha Davshuna on Pesach Haggadah, Magid, Rabban Gamliel's Three Things
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רבן גמליאל אומר כל שלא אמר שלשה דברים אלו וכו'. כלומ' אפילו יאכל פסח מצה ומרור. אינו יוצא ידי חובתו אם לא יאמר ג' דברים אלו למה הם באי' שמצאנו שהכתוב מקפי' על אמיר' והגדה.
Rabbi Mark Greenspan
Rabban Gamliel said, anyone who did not mention these three things. That is, even if he ate the Passover offering, matzah and the Bitter herbs, he will not have fulfilled his obligation if he did not explain why we eat these three things, since the Torah emphasizes the explanation and the telling.