1Co 5:7-8 Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us: (8) 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.
Exo 12:1-15 And the LORD spake unto Moses and Aaron in the land of Egypt, saying, (2) This month shall be unto you the beginning of months: it shall be the first month of the year to you. (3) 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: (4) 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. (5) Your lamb shall be without blemish, a male of the first year: ye shall take it out from the sheep, or from the goats: (6) 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. (7) 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. (8) And they shall eat the flesh in that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it. (9) 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. (10) 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. (11) 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. (12) 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. (13) 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. (14) 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. (15) 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.
1Co 11:17-34 Now in this that I declare unto you I praise you not, that ye come together not for the better, but for the worse. (18) For first of all, when ye come together in the church, I hear that there be divisions among you; and I partly believe it. (19) For there must be also heresies among you, that they which are approved may be made manifest among you. (20) When ye come together therefore into one place, this is not to eat the Lord’s supper. (21) For in eating every one taketh before other his own supper: and one is hungry, and another is drunken. (22) What? have ye not houses to eat and to drink in? or despise ye the church of God, and shame them that have not? What shall I say to you? shall I praise you in this? I praise you not. (23) For I have received of the Lord that which also I delivered unto you, That the Lord Jesus the same night in which he was betrayed took bread: (24) And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me. (25) After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me. (26) For as often as ye eat this bread, and drink this cup, ye do shew the Lord’s death till he come. (27) Wherefore whosoever shall eat this bread, and drink this cup of the Lord, unworthily, shall be guilty of the body and blood of the Lord. (28) But let a man examine himself, and so let him eat of that bread, and drink of that cup. (29) For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord’s body. (30) For this cause many are weak and sickly among you, and many sleep. (31) For if we would judge ourselves, we should not be judged. (32) But when we are judged, we are chastened of the Lord, that we should not be condemned with the world. (33) Wherefore, my brethren, when ye come together to eat, tarry one for another. (34) And if any man hunger, let him eat at home; that ye come not together unto condemnation. And the rest will I set in order when I come.