Treasury of Scripture Knowledge

Summary

Because all the firstborn are mine; for on the day that I smote all the firstborn in the land of Egypt I hallowed unto me all the firstborn in Israel, both man and beast: mine shall they be: I am the LORD.

Bible References

Because

Numbers 8:16
For they are wholly given to me from among the children of Israel; instead of all who open the womb, even the firstborn of all the children of Israel, I have taken them to me.
Numbers 18:15
Everything that opens the womb, of all flesh which they offer to Yahweh, both of man and animal shall be yours: nevertheless you shall surely redeem the firstborn of man, and you shall redeem the firstborn of unclean animals.
Exodus 13:2
"Sanctify to me all of the firstborn, whatever opens the womb among the children of Israel, both of man and of animal. It is mine."
Exodus 22:29
"You shall not delay to offer from your harvest and from the outflow of your presses. "You shall give the firstborn of your sons to me.
Exodus 34:19
"All that opens the womb is mine; and all your livestock that is male, the firstborn of cow and sheep.
Leviticus 27:26
"'Only the firstborn among animals, which is made a firstborn to Yahweh, no man may dedicate it; whether an ox or sheep, it is Yahweh's.
Ezekiel 44:30
The first of all the first fruits of every thing, and every offering of everything, of all your offerings, shall be for the priest: you shall also give to the priests the first of your dough, to cause a blessing to rest on your house.
Luke 2:23
(as it is written in the law of the Lord, "Every male who opens the womb shall be called holy to the Lord"),
Hebrews 12:23
to the general assembly and assembly of the firstborn who are enrolled in heaven, to God the Judge of all, to the spirits of just men made perfect,

On the day

Exodus 12:29
It happened at midnight, that Yahweh struck all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the captive who was in the dungeon; and all the firstborn of livestock.
Exodus 13:15
and it happened, when Pharaoh would hardly let us go, that Yahweh killed all the firstborn in the land of Egypt, both the firstborn of man, and the firstborn of animal. Therefore I sacrifice to Yahweh all that opens the womb, being males; but all the firstborn of my sons I redeem.'