Exo Exodus, chapter Book of Exodus, chapter 12
And it came to pass, that at midnight the LORD-Yehōvah (Messiah Pre-Incarnate) struck all the firstborn in the land of Mitzrayim [Egypt - The Narrow Place], from the firstborn of Par’oh [Pharaoh - Great House] that sat on his throne unto the firstborn of the captive that [was] in the dungeon; and all the firstborn of cattle.