Exodus 12:25-33

25And it shall come to pass, when ye are come to the land which Jehovah will give you, according as he hath promised, that ye shall keep this service. 26And it shall come to pass, when your children shall say unto you, What mean ye by this service? 27that ye shall say, It is the sacrifice of Jehovah’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. 28And the children of Israel went and did so; as Jehovah had commanded Moses and Aaron, so did they.

29And it came to pass at midnight, that Jehovah smote all the first-born in the land of Egypt, from the first-born of Pharaoh that sat on his throne unto the first-born of the captive that was in the dungeon; and all the first-born of cattle. 30And Pharaoh rose up in the night, he, and all his servants, and all the Egyptians; and there was a great cry in Egypt; for there was not a house where there was not one dead. 31And he called for Moses and Aaron by night, and said, Rise up, get you forth from among my people, both ye and the children of Israel; and go, serve Jehovah, as ye have said. 32Take both your flocks and your herds, as ye have said, and be gone; and bless me also. 33And the Egyptians were urgent upon the people, to send them out of the land in haste; for they said, We are all dead men.