Exodus 12:15-18 - The Festival Of Unleavened Bread

¹⁵ You will eat unleavened bread for seven days. Surely on the first day you shall remove yeast from your houses, because anyone [who] eats [food with] yeast from the first day until the seventh day--that person will be cut off from Israel. ¹⁶ It will be for you on the first day a holy assembly and on the seventh day a holy assembly; no work will be done on them; only what is eaten by every person, it alone will be prepared for you.

¹⁷ "And you will keep the Feast of Unleavened Bread, because on this very day I brought out your divisions from the land of Egypt, and you will keep this day for your generations as a lasting statute. ¹⁸ On the first [day], on the fourteenth day of the month, in the evening, you will eat unleavened bread until the evening of the twenty-first day of the month.