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 being given, they were given to me from the midst of the sons of Israel; instead of the first-born cleaving every womb, every one from the sons of Israel, have I taken them to me.
Numbers 18:15
Every thing cleaving the womb for all flesh, which they shall bring to Jehovah, in man or in cattle, shall be to thee: but redeeming, thou shalt redeem the first-born of man, and the firstborn of unclean cattle thou shalt redeem.
Exodus 13:2
Consecrate to me every first-born bursting open every womb among the sons of Israel, of man and of cattle: it is to me.
Exodus 22:29
Thy fulness and thy tears thou shalt not delay: the first-born of thy sons thou shalt give to me.
Exodus 34:19
All opening the womb is to me: all thy cattle, the male, the firstling of the ox or sheep.
Leviticus 27:26
But the first-born which shall be first to Jehovah among the cattle, a man shall not consecrate it; if an ox, if a sheep, it is to Jehovah.
Ezekiel 44:30
And the first of all the first-fruits of all, and every oblation of all from all your oblations, shall be for the priests: and the first of your grouts ye shall give to the priest to cause blessing to rest upon thy house.
Luke 2:23
(As has been written in the law of the Lord, That every male openingthe womb shall be called holy to the Lord;)
Hebrews 12:23
To the assembly of people, and church of the firstborn, transcribed in the heavens, and to God the Judge of all, and. to the spirits of the just perfected,

On the day

Exodus 12:29
And it will be in the middle of the night, and Jehovah struck every firstborn in the land of Egypt, from the first-born of Pharaoh sitting upon his throne, to the first-born of the captive which is in the house of the pit; and every first-born of the cattle.
Exodus 13:15
And it shall be when Pharaoh was hard to send us forth, and Jehovah will kill every first-born in the land of Egypt, from the first-born of man to the firstborn of cattle; for this I sacrifice to Jehovah all bursting forth the womb, the males; and all the first-born of my sons I will redeem.