Exodus 12:27-31

then you shall say, ‘It is a Passover sacrifice to the Lord because He passed over the houses of the sons of Israel in Egypt when He struck the Egyptians, but spared our homes.’ ” And the people bowed low and worshiped.

Then the sons of Israel went and did so; just as the Lord had commanded Moses and Aaron, so they did.

Now it came about at midnight that the Lord struck all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the captive who was in the dungeon, and all the firstborn of cattle.

And Pharaoh got up in the night, he and all his servants and all the Egyptians, and there was a great cry in Egypt, for there was no home where there was not someone dead.

Then he called for Moses and Aaron at night and said, “Rise up, get out from among my people, both you and the sons of Israel; and go, worship the Lord, as you have said.