Exodus 12:29, 33, 42, 51

And that night at midnight, the LORD struck down all the firstborn sons in the land of Egypt, from the firstborn son of Pharaoh, who sat on his throne, to the firstborn son of the prisoner in the dungeon. Even the firstborn of their livestock were killed.

All the Egyptians urged the people of Israel to get out of the land as quickly as possible, for they thought, “We will all die!”

On this night the LORD kept his promise to bring his people out of the land of Egypt. So this night belongs to him, and it must be commemorated every year by all the Israelites, from generation to generation.

On that very day the LORD brought the people of Israel out of the land of Egypt like an army.