Translation:Mishnah/Seder Moed/Tractate Pesachim/Chapter 10/5

Rabban Gamliel used to say:
Whoever does not mentioned these three things on Passover does not discharge his duty, and these are they: the Passover-offering, unleavened bread, and bitter herbs.
[The] Passover-offering [is offered] because the Omnipresent One passed over the houses of our ancestors in Egypt.
Unleavened bread [is eaten] because our ancestors were redeemed from Egypt.
[The] bitter herb is [eaten] because the Egyptians embittered the lives of our ancestors in Egypt.

In every generation a person must regard himself as though he personally had gone out of Egypt, as it is said:
“And you shall tell your son in that day, saying: ‘It is because of what the Lord did for me when I came forth out of Egypt.’”
Therefore it is our duty to thank, praise, laud, glorify, exalt, honor, bless, extol, and adore Him Who performed all these miracles for our ancestors and us;
He brought us forth from bondage into freedom, from sorrow into joy, from mourning into festivity, from darkness into great light, and from servitude into redemption.
Therefore let us say before Him, Hallelujah!