Exodus 12:24-34

24 Thou shalt keep this thing as a law for thee and thy children for ever.
25 And when you have entered into the land which the Lord will give you, as he hath promised, you shall observe these ceremonies.
26 And when your children shall say to you: What is the meaning of this service?
27 You shall say to them: It is the victim of the passage of the Lord, when he passed over the houses of the children of Israel in Egypt, striking the Egyptians, and saving our houses. And the people bowing themselves, adored.
28 And the children of Israel going forth, did as the Lord had commanded Moses and Aaron.
29 And it came to pass at midnight, the Lord slew every firstborn in the land of Egypt, from the firstborn of Pharao, who sat on his throne, unto the firstborn of the captive woman that was in the prison, and all the firstborn of cattle.
30 And Pharao arose in the night, and all his servants, and all Egypt: and there arose a great cry in Egypt; for there was not a house wherein there lay not one dead.
31 And Pharao calling Moses and Aaron, in the night, said: Arise and go forth from among my people, you and the children of Israel: go, sacrifice to the Lord as you say.
32 Your sheep and herds take along with you, as you demanded, and departing bless me.
33 And the Egyptians pressed the people to go forth out of the land speedily, saying: We shall all die.
34 The people therefore took dough before it was leavened; and tying it in their cloaks, put it on their shoulders.
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