Exodus 12:23-30

23When the LORD passes through to strike down the Egyptians, He will see the blood on the top and sides of the doorframe and will pass over that doorway; so He will not allow the destroyer to enter your houses and strike you down.

24And you are to keep this command as a permanent statute for you and your descendants. 25When you enter the land that the LORD will give you as He promised, you are to keep this service.

26When your children ask you, ‘What does this service mean to you?’ 27you are to reply, ‘It is the Passover sacrifice to the LORD, who passed over the houses of the Israelites in Egypt when He struck down the Egyptians and spared our homes.’”

Then the people bowed down and worshiped. 28And the Israelites went and did just what the LORD had commanded Moses and Aaron.

29Now at midnight the LORD struck down every firstborn male in the land of Egypt, from the firstborn of Pharaoh, who sat on his throne, to the firstborn of the prisoner in the dungeon, as well as all the firstborn among the livestock.

30During the night Pharaoh got up—he and all his officials and all the Egyptians—and there was loud wailing in Egypt; for there was no house without someone dead.