Firstborn of Egyptians Killed
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Exodus 11:5
and every firstborn son in the land of Egypt will die, from the firstborn of Pharaoh who sits on his throne, to the firstborn of the servant girl behind the hand mill, as well as the firstborn of all the cattle.
Exodus 12:12, 29
On that night I will pass through the land of Egypt and strike down every firstborn male, both man and beast, and I will execute judgment against all the gods of Egypt. I am the LORD. / Now at midnight the LORD struck down every firstborn male in the land of Egypt, from the firstborn of Pharaoh, who sat on his throne, to the firstborn of the prisoner in the dungeon, as well as all the firstborn among the livestock.
Exodus 13:15
And when Pharaoh stubbornly refused to let us go, the LORD killed every firstborn in the land of Egypt, both of man and beast. This is why I sacrifice to the LORD the firstborn male of every womb, but I redeem all the firstborn of my sons.’
Numbers 33:4
who were burying all their firstborn, whom the LORD had struck down among them; for the LORD had executed judgment against their gods.