Exodus 12:1 says, And the LORD spake unto Moses and Aaron in the land of Egypt, saying,  Then verse two adds, This month shall be unto you the beginning of months: it shall be the first month of the year to you.  God told Moses and Aaron that the month that they left Egypt would be the beginning of a new year for the Israelites.  When we accept Christ as our Savior an Lord, it is a new start in life for us.  We may not literally start a new calendar, but we do have a new division in time, that being the time when we were doomed without hope and then when we claim everlasting life with Christ.  Verse three states, Speak ye unto 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:  God begin to give Moses instructions for all the Israelites about what they were to do and how they were later to commemorate the day of deliverance.  Though we may not do anything special to commemorate the day we accept Christ, we should never forget it.  We do not celebrate it collectively because it is different for each individual.  Verse four adds, And if the household be too little for the lamb, let him and his neighbour next unto his house take it according to the number of the souls; every man according to his eating shall make your count for the lamb.  God told Moses that some households might be to small to sacrifice a lamb, but they were not exempt for the commemoration, but were to combine with another household for it.  We are never to small in our faith to celebrate our salvation, but fortunately we do not have to combine with others to do so, though it never hurts to do this  Verse five continues, Your lamb shall be without blemish, a male of the first year: ye shall take it out from the sheep, or from the goats:  The sacrifice was to be the best that the household had.  Once we come to God by faith in Christ, then we should sacrifice, or give, to Him the best of everything we have.  I believe that more accurately, we should give God everything we have, since it all belongs to Him anyway.  Verse six adds, And ye 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.  They were to keep the lambs separated for four days, the assemble together for the sacrifice.  Verse seven goes on, 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.  They were to put the blood on the door post of the houses where they were to eat.  As followers of Christ, we are always living under the sacrifice of His shed blood.  Verse eight adds, And they shall eat the flesh in that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it.  They were to eat the meat with unleavened bread and bitter herbs that night.  This was to be a reminder of their deliverance from Egypt, just as the Lord's Supper is a reminder of our deliverance by Christ today.  Verse nine continues, Eat not of it raw, nor sodden at all with water, but roast with fire; his head with his legs, and with the purtenance thereof.  They were to roast and eat all of the lamb.  Verse ten states, And ye shall let nothing of it remain until the morning; and that which remaineth of it until the morning ye shall burn with fire.  Nothing was to remain of the lamb until morning, but if it did, then it was to be burned.  Verse eleven continues, And thus shall ye eat it; with your loins girded, your shoes on your feet, and your staff in your hand; and ye shall eat it in haste: it is the LORD’s passover.  God told Moses to tell them to eat it ready to travel, because it was God's Passover, and in this first Passover observance, they were to leave Egypt.  When we celebrate the Lord's Supper, we should likewise be ready to go out into the world and witness to the lost people about what Christ has done for us.  Verse twelve continues, 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.  God said that He was going to pass through that night and execute His judgment on the Egyptians.  There is coming a day of judgment of everyone, and those who are not covered by the blood of Christ will suffer everlasting punishment.  Verse twelve concludes, And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy you, when I smite the land of Egypt.  The blood of the lamb on the doorpost then was to be a sign for God to Passover the house.  God did not just exempt all the Israelites, but required them to obey His instructions for deliverance.  God does not just save everyone today, but requires us to accept His gift of salvation through Christ.  Though salvation is a free gift from God, each individual must accept it in order to be cleansed by the blood of Christ.