Exodus 12:24-30

“You must keep this command as a law for you and your descendants from now on. Do this when you go to the land the LORD has promised to give you. When your children ask you, ‘Why are we doing these things?’ you will say, ‘This is the Passover sacrifice to honor the LORD. When we were in Egypt, the LORD passed over the houses of Israel, and when he killed the Egyptians, he saved our homes.’ ” Then the people bowed down and worshiped the LORD. They did just as the LORD commanded Moses and Aaron. At midnight the LORD killed all the firstborn sons in the land of Egypt—from the firstborn of the king who sat on the throne to the firstborn of the prisoner in jail. Also, all the firstborn farm animals died. The king, his officers, and all the Egyptians got up during the night because someone had died in every house. So there was a loud outcry everywhere in Egypt.