Exodus 12:24-30

“Obey these instructions as a lasting ordinance for you and your descendants. When you enter the land that the LORD will give you as he promised, observe this ceremony. And when your children ask you, ‘What does this ceremony mean to you?’ then tell them, ‘It is the Passover sacrifice to the LORD, who passed over the houses of the Israelites in Egypt and spared our homes when he struck down the Egyptians.’ ” Then the people bowed down and worshiped. The Israelites did just what the LORD commanded Moses and Aaron. At midnight the LORD struck down all the firstborn in Egypt, from the firstborn of Pharaoh, who sat on the throne, to the firstborn of the prisoner, who was in the dungeon, and the firstborn of all the livestock as well. Pharaoh and all his officials and all the Egyptians got up during the night, and there was loud wailing in Egypt, for there was not a house without someone dead.