משנה אויף שמות 1:14

Rabban Gamaliel used to say: whoever does not make mention of these three things on Pesah does not fulfill his duty. And these are they: the pesah, matzah, and bitter herbs. The pesah because the Omnipresent passed over the houses of our fathers in Egypt. The matzah because our fathers were redeemed from Egypt. The bitter herb because the Egyptians embittered the lives of our fathers in Egypt. In every generation a man is obligated to regard himself as though he personally had gone forth from Egypt, because it is said, “And you shall tell your son on that day, saying: ‘It is because of that which the Lord did for me when I came forth out of Egypt” (Exodus 13:8). Therefore it is our duty to thank, praise, laud, glorify, raise up, beautify, bless, extol, and adore Him who made all these miracles for our fathers and ourselves; He brought us forth from slavery into freedom, from sorrow into joy, from mourning into festivity, from darkness into great light, and from servitude into redemption. Let us say before him, Hallelujah!