טרם יחמץ. הַמִּצְרִים לֹא הִנִּיחוּם לִשְׁהוֹת כְּדֵי חִמּוּץ:
טרם יחמץ BEFORE IT WAS LEAVENED — The Egyptians did not allow them to stay long enough for the dough to become leavened.
Rabbi Haim ibn Attar (Morocco, 1696-1743)
מצות כי לא חמץ, unleavened breads because it was not leavened. The Torah means that the reason they baked Matzot was that they did not have permission to eat leavened bread; as a result they had to hasten in order to bake matzah. These loaves turned out to be matzot even though some time had elapsed between the kneading of the dough and the baking. Possibly, they kept the dough in motion in order to prevent it from becoming leavened [...]
According to this explanation, why did the children of Israel eat matzah?
You shall slaughter the passover sacrifice for the LORD your God, from the flock and the herd, in the place where the LORD will choose to establish His name. You shall not eat anything leavened with it; for seven days thereafter you shall eat unleavened bread, bread of poverty —for you departed from the land of Egypt hurriedly—so that you may remember the day of your departure from the land of Egypt as long as you live. For seven days no leaven shall be found with you in all your territory, and none of the flesh of what you slaughter on the evening of the first day shall be left until morning.
Hezekiah ben Manoah, France, 13th century
לחם עוני, “bread of poverty.” Poor people when given a small amount of flour, do not have a vessel at hand in order to make a proper dough. They also do not have enough time to spare to wait for the dough to rise before baking it. Therefore they throw the mixture of flour and water into the heated stove at once and retrieve is as soon as it is baked.
The sages of the Mishnah disagree regarding until what time leaven may be eaten and at what time it must be removed on Passover eve. Rabbi Meir says: One may eat leaven the entire fifth hour of the fourteenth of Nisan, and one must burn it immediately afterward at the beginning of the sixth hour. Rabbi Yehuda says: One may eat the entire fourth hour and one places it in abeyance for the entire fifth hour, and one burns it at the beginning of the sixth hour.
On the night of the 14th of Nissan after searching the home for leaven one recites the following:
"All leavened products and hametz which are in my possession which I have not seen nor removed, and of which I am unaware shall be non-existent and ownerless like the dust of the earth."
On the day of the 14th of Nissan following the destruction of the leaven one recites the following:
"All leavened food that is in my possession whether or not I saw it and whether or not I have removed it shall be nonexistent and owner-less like the dust of the earth."
The Torah commands us to eat matzah on the night preceding the fifteenth day of Nissan, as it is written: "In the evening, you shall eat unleavened bread" (Exodus 12:18), everywhere and throughout time. It did not make this eating dependent on the Passover sacrifice. Rather this is a commandment on its own; and [the time of] its commandment is all of the night. But during the rest of the festival, the eating of matsa is optional - if he wants, he may eat matsa; [and] if he wants, he may eat rice, millet, roasted grains or fruits [instead]. However on the night of the fifteenth alone, it is an obligation. By eating a piece of matzah the size of an olive [on the night of the fifteenth] one fulfills his duty.
Rabban Gamliel would say: Anyone who did not say these three 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 the Omnipresent passed over [pasaḥ] the houses of our forefathers in Egypt, as it is stated: “That you shall say: It is the sacrifice of the Lord’s Paschal offering for He passed over the houses of the children of Israel in Egypt, when he smote the Egyptians, and delivered our houses” (Exodus 12:27). 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) [...]
Rabbi Levi said, "One who eats matzah on the eve of Passover is like one who has intercourse with his betrothed in the house of his father-in-law; and the one who has intercourse with his betrothed in the house of his father-in-law is lashed."
