For I will pass through the land of Egypt this night and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment [proving their helplessness]. I am the Lord.
At midnight the Lord slew every firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the prisoner in the dungeon, and all the firstborn of the livestock.
But I will judge the nation to whom they will be slaves, said God, and after that they will escape and come forth and worship Me in this [very] place. [Gen. 15:13, 14; Exod. 3:12.]
By faith (simple trust and confidence in God) he instituted and carried out the Passover and the sprinkling of the blood [on the doorposts], so that the destroyer of the firstborn (the angel) might not touch those [of the children of Israel]. [Exod. 12:21-30.]