Leviticus 27:26
"'Only the firstborn among animals, which is made a firstborn to the LORD, no man may dedicate it; whether an ox or sheep, it is the LORD's.
Exodus 13:2
"Sanctify to me all of the firstborn, whatever opens the womb among the children of Israel, both of man and of animal. It is mine."
Exodus 13:12-13
that you shall set apart to the LORD all that opens the womb, and every firstborn which you have that comes from an animal. The males shall be the LORD's.
Exodus 22:30
You shall do likewise with your cattle and with your sheep. Seven days it shall be with its mother, then on the eighth day you shall give it to me.
Numbers 18:17
"But you shall not redeem the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat. They are holy. You shall sprinkle their blood on the altar, and shall burn their fat for an offering made by fire, for a pleasant aroma to the LORD.
Deuteronomy 15:19
All the firstborn males that are born of your herd and of your flock you shall sanctify to the LORD your God: you shall do no work with the firstborn of your herd, nor shear the firstborn of your flock.