As it is written in the Law of the Lord, Every [firstborn] male that opens the womb shall be set apart and dedicated and called holy to the Lord–[Exod. 13:1, 2, 12; Num. 8:17.]
Sanctify (consecrate, set apart) to Me all the firstborn [males]; whatever is first to open the womb among the Israelites, both of man and of beast, is Mine.
For all the firstborn are Mine. On the day that I slew all the firstborn in the land of Egypt, I consecrated for Myself all the firstborn in Israel, both man and beast; Mine they shall be. I am the Lord.
You shall not delay to bring to Me from the fullness [of your harvested grain] and the outflow [of your grape juice and olive oil]; give Me the firstborn of your sons [or redeem them]. [Exod. 34:19, 20.]
Everything that first opens the womb in all flesh, which they bring to the Lord, whether it be of men or beasts, shall be yours. Nevertheless the firstborn of man you shall surely redeem, and the firstling of unclean beasts you shall redeem.