Exodus 13:2

and you shall devote to Yahweh the first offspring of every womb and the first offspring of every beast that you own; the males belong to Yahweh.

“You shall not delay the offering from the fullness of your harvest and the juice of your wine vat. The firstborn of your sons you shall give to Me.

“The first offspring from every womb belongs to Me, even of all your male livestock, the first offspring from cattle and sheep.

‘However, a firstborn among animals, which as a firstborn belongs to Yahweh, no man may set it apart as holy; whether ox or sheep, it is Yahweh’s.

“Now, behold, I have taken the Levites from among the sons of Israel instead of every firstborn, the first offspring of the womb among the sons of Israel. So the Levites shall be Mine.

“For all the firstborn are Mine; on the day that I struck down all the firstborn in the land of Egypt, I sanctified to Myself all the firstborn in Israel, from man to beast. They shall be Mine; I am Yahweh.”

for they are wholly given to Me from among the sons of Israel. I have taken them for Myself instead of every first issue of the womb, the firstborn of all the sons of Israel.

“For every firstborn among the sons of Israel is Mine, among the men and among the animals; on the day that I struck down all the firstborn in the land of Egypt I sanctified them for Myself.

“You shall set apart as holy to Yahweh your God all the firstborn males that are born of your herd and of your flock; you shall not work with the firstborn of your herd nor shear the firstborn of your flock.

and to bring to the house of our God the firstborn of our sons and of our cattle, and the firstborn of our herds and our flocks as it is written in the law, for the priests who are ministering in the house of our God.

“Moreover, you took your sons and daughters, whom you had borne to Me, and sacrificed them to idols to be devoured. Were your harlotries so small a matter?

“You slaughtered My children and gave them up to idols by causing them to pass through the fire.

(as it is written in the Law of the Lord, “Every firstborn male that opens the womb shall be called holy to the Lord”),