Hametz

(6) and on the fifteenth day of that month G-d’s Feast of Unleavened Bread. You shall eat unleavened bread for seven days....

(10) Speak to the Israelite people and say to them: When you enter the land that I am giving to you and you reap its harvest, you shall bring the first sheaf of your [BARLEY] harvest to the priest...

(15) And from the day on which you bring the sheaf of elevation offering [of BARLEY], the day after the sabbath, count off seven weeks. They must be complete: (16) you must count until the day after the seventh week—fifty days; then you shall bring an offering of new grain [WHEAT] to G-d.

and after Rabbi Alexandri prayed, he would say the following:

Master of the Universe, it is revealed and known before You that our will is to perform Your will, and what prevents us?
On the one hand, the yeast (sourdough starter) in the dough, an inclination that is within every person; and the subjugation to the kingdoms on the other.

(25) And Joseph said to Pharaoh, “Pharaoh’s dreams are one and the same: Pharaoh has been told what God is about to do....

(29) Immediately ahead are seven years of great abundance in all the land of Egypt. (30) After them will come seven years of famine, and all the abundance in the land of Egypt will be forgotten. As the land is ravaged by famine, (31) no trace of the abundance will be left in the land because of the famine thereafter, for it will be very severe...

(35) Let all the food of these good years that are coming be gathered, and let the grain be collected under Pharaoh’s authority as food to be stored in the cities. (36) Let that food be a reserve for the land for the seven years of famine which will come upon the land of Egypt, so that the land may not perish in the famine.”

(47) During the seven years of plenty, the land produced in abundance. (48) And he gathered all the grain of the seven years that the land of Egypt was enjoying, and stored the grain in the cities; he put in each city the grain of the fields around it. (49) So Joseph collected produce in very large quantity, like the sands of the sea, until he ceased to measure it, for it could not be measured...

(53) The seven years of abundance that the land of Egypt enjoyed came to an end, (54) and the seven years of famine set in, just as Joseph had foretold. There was famine in all lands, but throughout the land of Egypt there was bread. (55) And when all the land of Egypt felt the hunger, the people cried out to Pharaoh for bread; and Pharaoh said to all the Egyptians, “Go to Joseph; whatever he tells you, you shall do.”— (56) Accordingly, when the famine became severe in the land of Egypt, Joseph laid open all that was within, and rationed out grain to the Egyptians. The famine, however, spread over the whole world. (57) So all the world came to Joseph in Egypt to procure rations, for the famine had become severe throughout the world.

(13) Now there was no bread in all the world, for the famine was very severe; both the land of Egypt and the land of Canaan languished because of the famine. (14) Joseph gathered in all the money that was to be found in the land of Egypt and in the land of Canaan, as payment for the rations that were being procured, and Joseph brought the money into Pharaoh’s palace. (15) And when the money gave out in the land of Egypt and in the land of Canaan, all the Egyptians came to Joseph and said, “Give us bread, lest we die before your very eyes; for the money is gone!” (16) And Joseph said, “Bring your livestock, and I will sell to you against your livestock, if the money is gone.” (17) So they brought their livestock to Joseph, and Joseph gave them bread in exchange for the horses, for the stocks of sheep and cattle, and the asses; thus he provided them with bread that year in exchange for all their livestock. (18) And when that year was ended, they came to him the next year and said to him, “We cannot hide from my lord that, with all the money and animal stocks consigned to my lord, nothing is left at my lord’s disposal save our persons and our farmland. (19) Let us not perish before your eyes, both we and our land. Take us and our land in exchange for bread, and we with our land will be slaves to Pharaoh; provide the seed, that we may live and not die, and that the land may not become a waste.” (20) So Joseph gained possession of all the farm land of Egypt for Pharaoh, all the Egyptians having sold their fields because the famine was too much for them; thus the land passed over to Pharaoh. (21) And he removed the population town by town, from one end of Egypt’s border to the other. (22) Only the land of the priests he did not take over, for the priests had an allotment from Pharaoh, and they lived off the allotment which Pharaoh had made to them; therefore they did not sell their land. (23) Then Joseph said to the people, “Whereas I have this day acquired you and your land for Pharaoh, here is seed for you to sow the land. (24) And when harvest comes, you shall give one-fifth to Pharaoh, and four-fifths shall be yours as seed for the fields and as food for you and those in your households, and as nourishment for your children.” (25) And they said, “You have saved our lives! We are grateful to my lord, and we shall be slaves to Pharaoh.”

We were slaves to Pharaoh in the land of Egypt. And G-d took us out from there with a strong hand and an outstretched forearm. And if the Holy One, blessed be "He," had not taken our ancestors from Egypt, behold we and our children and our children's children would [all] be enslaved to Pharaoh in Egypt. And even if we were all sages, all discerning, all elders, all knowledgeable about the Torah, it would be a commandment upon us to tell the story of the exodus from Egypt. And anyone who adds [and spends extra time] in telling the story of the exodus from Egypt, behold he is praiseworthy.