Exodus 12:29, 33, 42, 51

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.

The Egyptians urged the people to hurry and leave the country. “For otherwise,” they said, “we will all die!”

Because the LORD kept vigil that night to bring them out of Egypt, on this night all the Israelites are to keep vigil to honor the LORD for the generations to come.

And on that very day the LORD brought the Israelites out of Egypt by their divisions.