Leviticus 27:26
"No person is to consecrate the firstborn, because the firstborn of the animals already belongs to the LORD. Whether ox or goat, it belongs to the LORD.
Exodus 13:2
"Consecrate to me every firstborn male. Whatever is the first to open the womb among the Israelis, both of humans and of animals, belongs to me."
Exodus 13:12-13
you are to dedicate to the LORD everything that first opens the womb. All the firstborn males of your livestock belong to the LORD.
Exodus 22:30
You are to do the same with your oxen and your sheep. They shall be with their mother for seven days and then on the eighth day you are to give them to me.
Numbers 18:17
But you are not to redeem the firstborn of a cow, sheep, or a female goat. They are holy. You are to sprinkle their blood on the altar and burn their fat for an offering made by fire, a pleasing aroma to the LORD.
Deuteronomy 15:19
"Set apart for the LORD your God every firstborn male among your herd and flock. You must not put the firstborn of your ox to work or shear the firstborn of your flock.