Exodus 12:14-20

14This day shall be afor you a memorial day, and you shall keep it as a feast to the Lord; throughout your generations, as a bstatute forever, you shall keep it as a feast. 15 cSeven days you shall eat unleavened bread. On the first day you shall remove leaven out of your houses, for if anyone eats what is leavened, from the first day until the seventh day, dthat person shall be cut off from Israel. 16On the first day you shall hold a eholy assembly, and on the seventh day a holy assembly. No work shall be done on those days. But what everyone needs to eat, that alone may be prepared by you. 17And you shall observe the Feast of Unleavened Bread, for fon this very day I brought your ghosts out of the land of Egypt. Therefore you shall observe this day, throughout your generations, as a statute forever. 18 hIn the first month, from the fourteenth day of the month at evening, you shall eat unleavened bread until the twenty-first day of the month at evening. 19 iFor seven days no leaven is to be found in your houses. If anyone eats what is leavened, jthat person will be cut off from the congregation of Israel, kwhether he is a sojourner or a native of the land. 20You shall eat nothing leavened; in all your dwelling places you shall eat unleavened bread.”

Exodus 13:3-7

The Feast of Unleavened Bread

3Then Moses said to the people, lRemember this day in which you came out from Egypt, out of the house of slavery, mfor by a strong hand the Lord brought you out from this place. nNo leavened bread shall be eaten. 4Today, in the month of oAbib, you are going out. 5And when the Lord brings you into pthe land of the Canaanites, the Hittites, the Amorites, the Hivites, and the Jebusites, which qhe swore to your fathers to give you, a land rflowing with milk and honey, syou shall keep this service in this month. 6 tSeven days you shall eat unleavened bread, and on the seventh day there shall be a feast to the Lord. 7Unleavened bread shall be eaten for seven days; no leavened bread shall be seen with you, and no leaven shall be seen with you in all your territory.

Exodus 23:15

15 uYou shall keep the Feast of Unleavened Bread. As I commanded you, you shall eat unleavened bread for seven days at the appointed time in the month of vAbib, for in it you came out of Egypt. wNone shall appear before me empty-handed.

Leviticus 23:6-14

6And on the fifteenth day of the same month is the Feast of Unleavened Bread to the Lord; for seven days you shall eat unleavened bread. 7 xOn the first day you shall have a holy convocation; you shall not do any ordinary work. 8But you shall present a food offering to the Lord for seven days. On the seventh day is a holy convocation; you shall not do any ordinary work.”

The Feast of Firstfruits

9And the Lord spoke to Moses, saying, 10Speak to the people of Israel and say to them, yWhen you come into the land that I give you and reap its harvest, you shall bring the sheaf of zthe firstfruits of your harvest to the priest, 11and he shall aawave the sheaf before the Lord, so that you may be accepted. On the day after the Sabbath the priest shall wave it. 12And on the day when you abwave the sheaf, you shall offer a acmale lamb a year old without blemish as a burnt offering to the Lord. 13 adAnd the grain offering with it shall be two tenths of an ephah
An  ephah was about 3/5 bushel or 22 liters
of fine flour mixed with oil, a food offering to the Lord with a pleasing aroma, afand the drink offering with it shall be of wine, a fourth of a hin.
A  hin was about 4 quarts or 3.5 liters
14And you shall eat neither bread nor grain ahparched or aifresh until this same day, until you have brought the offering of your God: it is a statute forever throughout your generations in all your dwellings.

Matthew 26:17

The Passover with the Disciples

17 ajNow on akthe first day of Unleavened Bread the disciples came to Jesus, saying, “Where will you have us prepare for you to eat the Passover?”

1 Corinthians 5:7-8

7Cleanse out the old leaven that you may be a new lump, as you really are unleavened. For Christ, our Passover lamb, has been sacrificed. 8Let us therefore celebrate the festival, alnot with the old leaven, amthe leaven of malice and evil, but with the unleavened bread of sincerity and truth.

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