Exodus 11:5
And all the firstborn in the land of Egypt shall die, from the firstborn of Pharaoh that sitteth upon his throne, even unto the firstborn of the maidservant that is behind the mill; and all the firstborn of beasts.
Cross-references
In Exodus 4:23, God first threatened to kill Pharaoh's firstborn — now that threat is about to be carried out.
In Exodus 12:12, the plague is executed — the announcement here becomes reality in the same narrative.
Exodus 12:29 records the exact fulfillment — the Lord strikes down all firstborn exactly as announced here.
Exodus 13:15 explains that because of this plague, firstborn males are consecrated to God — the founding reason for redemption.
Psalm 78:51 poetically recalls God striking down Egypt's firstborn — the firstfruits of their strength in the tents of Ham.
Psalm 105:36 recounts the same plague — God struck down all firstborn as the firstfruits of Egypt's strength.
Psalm 135:8 summarizes this plague — God struck down the firstborn of Egypt, both of man and beast.
Psalm 136:10 cites this plague as a demonstration of God's steadfast love — striking down Egypt's firstborn.
Hebrews 11:28 highlights Moses' faith in keeping the Passover — so the Destroyer would not touch Israel's firstborn during this plague.