The origin of the Passover, the ensuing Days of Unleavened Bread and God’s command to the nation of Israel on how to celebrate these special days form the historical meaning of these days—Israel’s deliverance from Egyptian bondage. They had to obey God’s command to sacrifice the lamb and put the blood on their doorposts to avoid their firstborn being put to death along with the firstborn Egyptians (Exodus 12:1-13 Exodus 12:1-13  And the LORD spoke to Moses and Aaron in the land of Egypt saying,
 This month shall be to you the beginning of months: it shall be the first month of the year to you.
 Speak you to all the congregation of Israel, saying, In the tenth day of this month they shall take to them every man a lamb, according to the house of their fathers, a lamb for an house:
 And if the household be too little for the lamb, let him and his neighbor next to his house take it according to the number of the souls; every man according to his eating shall make your count for the lamb.
 Your lamb shall be without blemish, a male of the first year: you shall take it out from the sheep, or from the goats:
 And you shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening.
 And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it.
 And they shall eat the flesh in that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it.
 Eat not of it raw, nor sodden at all with water, but roast with fire; his head with his legs, and with the entrails thereof.
 And you shall let nothing of it remain until the morning; and that which remains of it until the morning you shall burn with fire.
 And thus shall you eat it; with your loins girded, your shoes on your feet, and your staff in your hand; and you shall eat it in haste: it is the LORD's passover.
 For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the LORD.
 And the blood shall be to you for a token on the houses where you are: and when I see the blood, I will pass over you, and the plague shall not be on you to destroy you, when I smite the land of Egypt.
American King James Version×, 21-27).
The power of God was what led to their freedom from Egypt, but they had to walk out. They couldn’t have walked out without God delivering them, but they wouldn’t have been freed if they hadn’t walked out. This offers an historic precedent that illustrates a fundamental principle of God’s plan—faith and trust in God and obedience to Him as a result of that faith—which is the principle of faith and works.
The instructions are clear and often repeated. The Israelites were given two commands regarding bread: 1. To eat unleavened bread throughout the seven-day period; and 2. Not to eat leavened bread during that seven-day period (Exodus 12:15-20 Exodus 12:15-20  Seven days shall you eat unleavened bread; even the first day you shall put away leaven out of your houses: for whoever eats leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
 And in the first day there shall be an holy convocation, and in the seventh day there shall be an holy convocation to you; no manner of work shall be done in them, save that which every man must eat, that only may be done of you.
 And you shall observe the feast of unleavened bread; for in this selfsame day have I brought your armies out of the land of Egypt: therefore shall you observe this day in your generations by an ordinance for ever.
 In the first month, on the fourteenth day of the month at even, you shall eat unleavened bread, until the one and twentieth day of the month at even.
 Seven days shall there be no leaven found in your houses: for whoever eats that which is leavened, even that soul shall be cut off from the congregation of Israel, whether he be a stranger, or born in the land.
 You shall eat nothing leavened; in all your habitations shall you eat unleavened bread.
American King James Version×; Exodus 13:3-10 Exodus 13:3-10  And Moses said to the people, Remember this day, in which you came out from Egypt, out of the house of bondage; for by strength of hand the LORD brought you out from this place: there shall no leavened bread be eaten.  This day came you out in the month Abib.  And it shall be when the LORD shall bring you into the land of the Canaanites, and the Hittites, and the Amorites, and the Hivites, and the Jebusites, which he swore to your fathers to give you, a land flowing with milk and honey, that you shall keep this service in this month.  Seven days you shall eat unleavened bread, and in the seventh day shall be a feast to the LORD.  Unleavened bread shall be eaten seven days; and there shall no leavened bread be seen with you, neither shall there be leaven seen with you in all your quarters.  And you shall show your son in that day, saying, This is done because of that which the LORD did to me when I came forth out of Egypt.  And it shall be for a sign to you on your hand, and for a memorial between your eyes, that the LORD's law may be in your mouth: for with a strong hand has the LORD brought you out of Egypt.  You shall therefore keep this ordinance in his season from year to year.
American King James Version×; Leviticus 23:6 Leviticus 23:6And on the fifteenth day of the same month is the feast of unleavened bread to the LORD: seven days you must eat unleavened bread.
American King James Version×).
There is a vitally important lesson here regarding the process of putting out sin, as well as the answer to the question of who puts out sin.
The Symbolism of Unleavened Bread
First of all, leavening and unleavened bread are symbols that portray the need to put out sin, but the act of putting out leavening does not put out sin.
The Israelites may have dutifully obeyed God’s command to put the leaven out of their quarters and avoid eating leavened bread, but they failed to exercise the faith and works necessary to put sin out of their lives.
So, what does unleavened bread symbolize?
It is significant that unleavened bread is involved in both the Passover service and the Feast of Unleavened Bread that follows on the heels of the Passover. The command to eat unleavened bread was to emphasize God’s deliverance of Israel from the bondage of Egypt (Exodus 13:3 Exodus 13:3And Moses said to the people, Remember this day, in which you came out from Egypt, out of the house of bondage; for by strength of hand the LORD brought you out from this place: there shall no leavened bread be eaten.
American King James Version×), which was so sudden that they didn’t even have time to let the bread rise (Exodus 12:31-39 Exodus 12:31-39  And he called for Moses and Aaron by night, and said, Rise up, and get you forth from among my people, both you and the children of Israel; and go, serve the LORD, as you have said.  Also take your flocks and your herds, as you have said, and be gone; and bless me also.  And the Egyptians were urgent on the people, that they might send them out of the land in haste; for they said, We be all dead men.  And the people took their dough before it was leavened, their kneading troughs being bound up in their clothes on their shoulders.  And the children of Israel did according to the word of Moses; and they borrowed of the Egyptians jewels of silver, and jewels of gold, and raiment:  And the LORD gave the people favor in the sight of the Egyptians, so that they lent to them such things as they required. And they spoiled the Egyptians.  And the children of Israel journeyed from Rameses to Succoth, about six hundred thousand on foot that were men, beside children.  And a mixed multitude went up also with them; and flocks, and herds, even very much cattle.  And they baked unleavened cakes of the dough which they brought forth out of Egypt, for it was not leavened; because they were thrust out of Egypt, and could not tarry, neither had they prepared for themselves any victual.
American King James Version×).
But the Bible documents the fact that taking the Israelites out of Egypt did not take Egypt out of the Israelites. In fact, the final incident that led to God refusing to let the generation who left Egypt enter the Promised Land was when they hatched a plan to return to Egypt.
The historical truths symbolized by leaven and unleavened bread form the basis of the spiritual truths in God’s plan of salvation (1 Corinthians 10:1-12 1 Corinthians 10:1-12  Moreover, brothers, I would not that you should be ignorant, how that all our fathers were under the cloud, and all passed through the sea;
 And were all baptized to Moses in the cloud and in the sea;
 And did all eat the same spiritual meat;
 And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.
 But with many of them God was not well pleased: for they were overthrown in the wilderness.
 Now these things were our examples, to the intent we should not lust after evil things, as they also lusted.
 Neither be you idolaters, as were some of them; as it is written, The people sat down to eat and drink, and rose up to play.
 Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.
 Neither let us tempt Christ, as some of them also tempted, and were destroyed of serpents.
 Neither murmur you, as some of them also murmured, and were destroyed of the destroyer.
 Now all these things happened to them for ensamples: and they are written for our admonition, on whom the ends of the world are come.
 Why let him that thinks he stands take heed lest he fall.
American King James Version×), some of which we learn by keeping the Passover and Days of Unleavened Bread today under the New Covenant.
Paul uses leavening (yeast) as a metaphor for the pervasive nature of sin illustrated by the fact that a little yeast affects the whole batch of dough. Because a blatant sin by a member of the Corinthian congregation was not being dealt with, Paul commands that the sinner be put out of the church (1 Corinthians 5:1-13 1 Corinthians 5:1-13  It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.
 And you are puffed up, and have not rather mourned, that he that has done this deed might be taken away from among you.
 For I truly, as absent in body, but present in spirit, have judged already, as though I were present, concerning him that has so done this deed,
 In the name of our Lord Jesus Christ, when you are gathered together, and my spirit, with the power of our Lord Jesus Christ,
 To deliver such an one to Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.
 Your glorying is not good. Know you not that a little leaven leavens the whole lump?
 Purge out therefore the old leaven, that you may be a new lump, as you are unleavened. For even Christ our passover is sacrificed for us:
 Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.
 I wrote to you in an letter not to company with fornicators:
 Yet not altogether with the fornicators of this world, or with the covetous, or extortionists, or with idolaters; for then must you needs go out of the world.
 But now I have written to you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a reviler, or a drunkard, or an extortionist; with such an one no not to eat.
 For what have I to do to judge them also that are without? do not you judge them that are within?
 But them that are without God judges. Therefore put away from among yourselves that wicked person.
American King James Version×): “Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us” (1 Corinthians 5:7 1 Corinthians 5:7Purge out therefore the old leaven, that you may be a new lump, as you are unleavened. For even Christ our passover is sacrificed for us:
American King James Version×).
The passage explains that the Church collectively was spiritually leavened because of the sin in their midst, not spiritually unleavened. How then were they unleavened? On one level, the simple answer is that they were unleavened because they had put leavening out of their homes, but they were not spiritually unleavened because they had not put the sinner out of their congregation.
So, Paul tells them they need to keep the Feast of Unleavened Bread, not with the leaven of sin in their midst, but with the unleavened (sin-free) qualities of sincerity and truth (verse 8)—i.e. “as an expression of pure or unadulterated motives” (Louw-Nida lexicon).
This incident offers principles regarding who puts sin out of our lives today, and how. Christ died for our sins, so we, with the help of the Holy Spirit, must put sin out of our lives.
An Impossible Task
Another lesson regarding the typology of leaven is that just as it is impossible to get rid of all leaven (although the process of repentance involves putting out sin and doing our best to keep sin out of our lives), it is impossible to put all sin out of our lives. As the apostle John wrote, “If we say that we have no sin, we deceive ourselves, and the truth is not in us” (1 John 1:8 1 John 1:8If we say that we have no sin, we deceive ourselves, and the truth is not in us.
American King James Version×).
We need the sacrifice of Christ to pay the price and put sin out of our lives: “If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness” (1 John 1:9 1 John 1:9If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
American King James Version×). The unleavened bread in the Passover service and during the Days of Unleavened Bread represents Jesus Christ and His role in putting sin out of our lives.
Our main focus for the Passover and Feast of Unleavened Bread must be our faith in Christ as our Passover sacrificed for us, not only on putting leaven out of our homes (although that is a valuable reminder of our need to do our part in putting sin out of our lives; i.e. faith and “works” [James 2:14-18 James 2:14-18  What does it profit, my brothers, though a man say he has faith, and have not works? can faith save him?
 If a brother or sister be naked, and destitute of daily food,
 And one of you say to them, Depart in peace, be you warmed and filled; notwithstanding you give them not those things which are needful to the body; what does it profit?
 Even so faith, if it has not works, is dead, being alone.
 Yes, a man may say, You have faith, and I have works: show me your faith without your works, and I will show you my faith by my works.
American King James Version×]).
Revelation 20:6 Revelation 20:6Blessed and holy is he that has part in the first resurrection: on such the second death has no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years.
American King James Version×tells us that the second death (the penalty for unrepentant sin) has no power over those in the first resurrection, because sin will finally be put out of our lives for all eternity!
Thank God! He gives us victory over sin and death through our Lord Jesus Christ (1 Corinthians 15:51-57 1 Corinthians 15:51-57  Behold, I show you a mystery; We shall not all sleep, but we shall all be changed,
 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
 For this corruptible must put on incorruption, and this mortal must put on immortality.
 So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
 O death, where is your sting? O grave, where is your victory?
 The sting of death is sin; and the strength of sin is the law.
 But thanks be to God, which gives us the victory through our Lord Jesus Christ.
American King James Version×, New Living Translation).
And thank God for His Holy Days that serve as annual reminders of the wonderful truths of His great master plan.