Exodus 12:21-30

21Then Moses called for all the elders of Israel, and said to them, Draw out and take for yourselves a lamb according to your families, and kill the passover.1 22And ye shall take a bunch of hyssop, and dip it in the blood that is in the basin, and strike the lintel and the two side posts with the blood that is in the basin; and none of you shall go out at the door of his house till the morning. 23For the LORD will pass through to smite the Egyptians; and when he seeth the blood upon the lintel, and on the two side posts, the LORD will pass over the door, and will not permit the destroyer to come in to your houses to smite you . 24And ye shall observe this thing for an ordinance to thee and to thy sons for ever. 25And it shall come to pass, when ye shall have come to the land which the LORD 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 to you, What mean you by this service? 27That ye shall say, It is the sacrifice of the LORD’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 away, and did as the LORD had commanded Moses and Aaron, so did they.

29And it came to pass, that at midnight the LORD smote all the firstborn in the land of Egypt, from the firstborn of Pharaoh that sat on his throne to the firstborn of the captive that was in the dungeon; and all the firstborn of cattle.2 30And Pharaoh rose 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.