New American Bible
because every firstborn is mine. When I struck down all the firstborn in the land of Egypt, I consecrated to me every firstborn in Israel, human being and beast alike. They belong to me; I am the LORD.

Douay-Rheims Bible
For every firstborn is mine: since I struck the firstborn in the land of Egypt: I have sanctified to myself whatsoever is firstborn in Israel both of man and beast, they are mine: I am the Lord.

For every firstborn is mine: since I struck the firstborn in the land of Egypt: I have sanctified to myself whatsoever is firstborn in Israel both of man and beast, they are mine: I am the Lord.

because

Numbers 8:16,17 I have taken them instead of the firstborn that open every womb in Israel, . . .

Numbers 18:15 Whatsoever is firstborn of all flesh, which they offer to the Lord, whether it be of men, or of beasts, shall belong to thee: only for the firstborn of man thou shalt take a price, and every beast that is unclean thou shalt cause to be redeemed,

Exodus 13:2,12 Sanctify unto me every firstborn that openeth the womb among the children of Israel, as well of men as of beasts: for they are all mine. . . .

Exodus 22:29 Thou shalt not delay to pay thy tithes and thy firstfruits: thou shalt give the firstborn of thy sons to me.

Exodus 34:19 All of the male kind that openeth the womb, shall be mine. Of all beasts; both of oxen and of sheep, it shall be mine.

Leviticus 27:26 The firstborn, which belong to the Lord, no man may sanctify and vow: whether it be bullock, or sheep, they are the Lord's.

Ezekiel 44:30 And the firstfruits of all the firstborn, and all the libations of all things that are offered, shall be the priest's: and you shall give the firstfruits of your meats to the priest, that he may return a blessing upon thy house.

Luke 2:23 As it is written in the law of the Lord: Every male opening the womb shall be called holy to the Lord:

Hebrews 12:23 And to the church of the firstborn who are written in the heavens, and to God the judge of all, and to the spirits of the just made perfect,

on the day

Exodus 12:29,30 And it came to pass at midnight, the Lord slew every firstborn in the land of Egypt, from the firstborn of Pharao, who sat on his throne, unto the firstborn of the captive woman that was in the prison, and all the firstborn of cattle. . . .

Exodus 13:15 For when Pharao was hardened, and would not let us go, the Lord slew every firstborn in the land of Egypt, from the firstborn of man to the firstborn of beasts: therefore I sacrifice to the Lord all that openeth the womb of the male sex, and all the firstborn of my sons I redeem.