From the ruler to the prisoner, every firstborn that was not behind the door with the blood of the sacrificial lamb lost his life that one night many years ago in Egypt.
That is the message of the Passover-there is no deliverance without the passover lamb: Jesus Christ
Exodus 12:29-30 And it came to pass 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 livestock. So Pharaoh rose in the night, he, all his servants, and all the Egyptians; and there was a great cry in Egypt, for [there was] not a house where [there was] not one dead.
1 Corinthians 5:7 Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us.