Exodus 12:29
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 34:20
You must redeem the firstborn of a donkey with a lamb; but if you do not redeem it, break its neck. You must redeem all the firstborn of your sons. No one shall appear before Me empty-handed.

Numbers 3:46
To redeem the 273 firstborn Israelites who outnumber the Levites,

Numbers 18:15
The firstborn of every womb, whether man or beast, that is offered to the LORD belongs to you. But you must surely redeem every firstborn son and every firstborn male of unclean animals.

Psalm 105:36
Then He struck all the firstborn in their land, the firstfruits of all their vigor.