Leviticus 27:26
" 'However, a man shall not consecrate a firstborn among livestock, which belongs as firstborn to Yahweh; whether an ox {or} small livestock, it is for Yahweh.
Exodus 13:2
"Consecrate to me every firstborn, the first offspring of every womb among the {Israelites}, among humans and among domestic animals; {it belongs to me}."
Exodus 13:12-13
you will hand over every first offspring of a womb to Yahweh, and every first offspring dropped by a domestic animal that will belong to you, the males [will be] for Yahweh.
Exodus 22:30
You will do likewise for your ox and for your sheep and goats; seven days it will be with its mother; on the eighth, you will give it to me.
Numbers 18:17
Only the firstborn of an ox or the firstborn of a sheep or the firstborn of a goat you will not redeem; they [are] holy. Their blood you will sprinkle over the altar, and their fat you will turn into smoke [as] an offering made by fire, a fragrance of appeasement for Yahweh.
Deuteronomy 15:19
"Every firstling male that is born of your herd and of your flock you shall consecrate to Yahweh your God; you shall not do work with the firstling of your ox, and you shall not shear the firstling of your flock.