Exodus 12:12-28

For I [the LORD] will pass through the land of Egypt on this night, and will strike down all the firstborn in the land of Egypt, both man and animal; against all the gods of Egypt I will execute judgments [exhibiting their worthlessness]. I am the LORD. The blood shall be a sign for you on [the doorposts of] the houses where you live; when I see the blood I shall pass over you, and no affliction shall happen to you to destroy you when I strike the land of Egypt. [1 Cor 5:7; Heb 11:28] ‘Now this day will be a memorial to you, and you shall keep it as a feast to the LORD; throughout your generations you are to celebrate it as an ordinance forever. [In the celebration of the Passover in future years,] seven days you shall eat unleavened bread, but on the first day you shall remove the leaven from your houses [because it represents the spread of sin]; for whoever eats leavened bread on the first day through the seventh day, that person shall be cut off and excluded from [the atonement made for] Israel. On the first day [of the feast] you shall have a holy and solemn assembly, and on the seventh day there shall be another holy and solemn assembly; no work of any kind shall be done on those days, except for the preparation of food which every person must eat—only that may be done by you. You shall also observe the Feast of Unleavened Bread, because on this very day I brought your hosts [grouped according to tribal armies] out of the land of Egypt; therefore you shall observe this day throughout your generations as an ordinance forever. In the first month, on the fourteenth day of the month at evening, you shall eat unleavened bread, [and continue] until the twenty-first day of the month at evening. Seven days no leaven shall be found in your houses; whoever eats what is leavened shall be cut off and excluded from [the atonement made for] the congregation of Israel, whether a stranger or native-born. [1 Cor 5:6-8] You shall eat nothing leavened; in all your dwellings you shall eat unleavened bread.’ ” Then Moses called for all the elders of Israel and said to them, “Go and take a lamb for yourselves according to [the size of] your families and slaughter the Passover lamb. You shall take a bunch of hyssop, dip it in the blood which is in the basin, and touch some of the blood to the lintel [above the doorway] and to the two doorposts; and none of you shall go outside the door of his house until morning. For the LORD will pass through to strike the Egyptians; and when He sees the blood on the lintel [above the entry way] and on the two doorposts, the LORD will pass over the door and will not allow the destroyer to come into your houses to slay you. You shall observe this event [concerning Passover] as an ordinance for you and for your children forever. When you enter the land which the LORD will give you, as He has promised, you shall keep and observe this service. When your children say to you, ‘What does this service mean to you?’ you shall say, ‘It is the sacrifice of the LORD’S Passover, for He passed over the houses of the Israelites in Egypt when He struck the Egyptians, but spared our houses.’ ” And the people bowed [their heads] low and worshiped [God]. Then the Israelites went and did [as they had been told]: just as the LORD had commanded Moses and Aaron, so they did.