Exodus 12:14  says, And this day shall be unto you for a memorial; and ye shall keep it a feast to the LORD throughout your generations; ye shall keep it a feast by an ordinance for ever.  God told Moses that the people of Israel were to keep this feast as a memorial forever.  We today really don't celebrate the Passover as they did, though we do usually make note of it, but we celebrate the Lord's Supper, when the power of death passed over us by the blood of Christ.  Verse fifteen states, Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.  The people were of Israel were to eat unleavened bread for a week and if they didn't, they were not to considered a part of the nation of Israel.  Today, there is no ritual that keeps us from being a part of God's kingdom, but there is a relationship that does.  We must accept Christ as our Savior and Lord in order to be a part of God's kingdom.  Verse sixteen adds, 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.  The first and last day of the feast were to be set aside for the worship of God, with only that work that was necessary being done.  Verse seventeen continues, And ye 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 ye observe this day in your generations by an ordinance for ever.  This was to be done on the day that God brought them out of the land of Egypt.  Our day of deliverance is the day that we accepted Christ as our Savior and Lord, and we should thank Him every day.  Verse eighteen says, In the first month, on the fourteenth day of the month at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.  Then verse eighteen adds, Seven days shall there be no leaven found in your houses: for whosoever eateth 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.  This was a repeat of the instructions given earlier, with the dates added and the fact that it would apply to strangers as well.  Verse twenty concludes, Ye shall eat nothing leavened; in all your habitations shall ye eat unleavened bread.  This was to be an important event since God emphasized it so much.  The observance of the Lord's Supper is not emphasized as much, nor is there a time given when we are to observe it, but we are told that as often as we do, that we are to be sincere in our observance of it.  Verse twenty-one says, Then Moses called for all the elders of Israel, and said unto them, Draw out and take you a lamb according to your families, and kill the passover.  Moses called the elders and told them to kill a lamb according to their families and make ready for the Passover.  Verse twenty-two adds, And ye shall take a bunch of hyssop, and dip it in the blood that is in the bason, and strike the lintel and the two side posts with the blood that is in the bason; and none of you shall go out at the door of his house until the morning. They were to put the blood of the lamb on their doors, and to stay in their houses.  We are saved by the blood of the Lamb, Jesus Christ, and should always remain under His blood.  Verse twenty-three continues, For the LORD will pass through to smite the Egyptians; and when he seeth the blood upon the lintel, and on the two side posts, the LORD will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you.  The blood was to be a sign that the people were to be spared, just as the blood of Christ is today.  The  people had a choice of whether to obey or not, just as people do today about believing in Christ.  Verse twenty-four proclaims, And ye shall observe this thing for an ordinance to thee and to thy sons for ever.  Moses told the people of Israel that this was to be celebrated forever, just as salvation through Christ should be celebrated forever.  Verse twenty-five adds, And it shall come to pass, when ye be come to the land which the LORD will give you, according as he hath promised, that ye shall keep this service.  This observance was to go on in the land that God was going to give them.  Verse twenty-six adds, And it shall come to pass, when your children shall say unto you, What mean ye by this service?  Moses told them that their children would ask them why they did this.  Verse twenty-seven continues, That ye shall say, It is the sacrifice of the LORD’s passover, who passed over the houses of the children of Israel in Egypt, when he smote the Egyptians, and delivered our houses. And the people bowed the head and worshipped.  The people of Israel were to teach their children the meaning of the Passover, just as we must teach our children, the next generation, about the gospel of Christ.  Verse twenty-eight declares, And the children of Israel went away, and did as the LORD had commanded Moses and Aaron, so did they.  The people did as Mises and Aaron instructed them to do.  For the gospel to have effect for someone today, that person must come to Christ as the gospel says. God did not force the people of Israel to put th blood over their doors, and He doesn't force people today to accept the gift of salvation.