Exodus 12:21-33

Then Moses called for all the elders of Israel and said to them, “Go and take for yourselves lambs according to your families, and slay the Passover lamb. You shall take a bunch of hyssop and dip it in the blood which is in the basin, and apply some of the blood that is in the basin to the lintel and the two doorposts; and none of you shall go outside the door of his house until morning. For the LORD will pass through to smite the Egyptians; and when He sees the blood on the lintel and on the two doorposts, the LORD will pass over the door and will not allow the destroyer to come in to your houses to smite you. And you shall observe this event as an ordinance for you and your children forever. When you enter the land which the LORD will give you, as He has promised, you shall observe this rite. And when your children say to you, ‘What does this rite mean to you?’ you shall say, ‘It is a Passover sacrifice to the LORD who passed over the houses of the sons of Israel in Egypt when He smote the Egyptians, but spared our homes.’ ” And the people bowed low and worshiped. Then the sons of Israel went and did so; just as the LORD had commanded Moses and Aaron, so they did. Now it came about at midnight that the LORD struck all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the captive who was in the dungeon, and all the firstborn of cattle. Pharaoh arose in the night, he and all his servants and all the Egyptians, and there was a great cry in Egypt, for there was no home where there was not someone dead. Then he called for Moses and Aaron at night and said, “Rise up, get out from among my people, both you and the sons of Israel; and go, worship the LORD, as you have said. Take both your flocks and your herds, as you have said, and go, and bless me also.” The Egyptians urged the people, to send them out of the land in haste, for they said, “We will all be dead.”