Pesachim 116B

שלשה דברים אלו בפסח לא יצא ידי חובתו, ואלו הן: פסח, מצה, ומרור. פסח ⁠— על שום שפסח המקום על בתי אבותינו במצרים, [שנאמר: ״ואמרתם זבח פסח הוא לה׳ אשר פסח וגו׳״].

these 3 matters on Passover has not fulfilled his obligation: The Paschal lamb, matza, and bitter herbs. When one mentions these matters, he must elaborate and explain them: The Paschal lamb is brought because God passed over [pasaḥ] the houses of our forefathers in Egypt, as it is stated: “That you should say: It is the sacrifice of YHWH’s Paschal offering for He passed over the houses of the children of Israel in Egypt, when he struck the Egyptians, and delivered our houses” (Exodus 12:27).

מצה ⁠— על שום שנגאלו אבותינו ממצרים, [שנאמר: ״ויאפו את הבצק אשר הוציאו ממצרים וגו׳״]. מרור ⁠— על שום שמררו המצריים את חיי אבותינו במצרים, שנאמר: [״וימררו את חייהם וגו׳״].

Rabban Gamliel continues to explain: The reason for matza is because our forefathers were redeemed from Egypt, as it is stated: “And they baked the dough that they took out of Egypt as cakes of matzot, for it was not leavened, as they were thrust out of Egypt and could not tarry, neither had they prepared for themselves any victual” (Exodus 12:39). The reason for bitter herbs is because the Egyptians embittered our forefathers’ lives in Egypt, as it is stated: “And they embittered their lives with hard service, in mortar and in brick; in all manner of service in the field, all the service that they made them serve was with rigor” (Exodus 1:14).

בכל דור ודור חייב אדם לראות את עצמו כאילו הוא יצא ממצרים, שנאמר: ״והגדת לבנך ביום ההוא לאמר בעבור זה עשה ה׳ לי בצאתי ממצרים״.

The tanna of the Mishnah further states: In each and every generation a person must view himself as though he personally left Egypt, as it is stated: “And you should tell your son on that day, saying: It is because of this which YHWH did for me when I came forth out of Egypt” (Exodus 13:8). In every generation, each person must say: “This which YHWH did for me,” and not: This which YHWH did for my forefathers.