On that night I will pass through the land of Egypt and strike down every firstborn son and firstborn male animal in the land of Egypt. I will execute judgment against all the gods of Egypt, for I am the Lord!
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.
It was by faith that Moses commanded the people of Israel to keep the Passover and to sprinkle blood on the doorposts so that the angel of death would not kill their firstborn sons.