Leviticus 27:26
However, the first-born of an animal, which should be Jehovah's first-born, no man shall sanctify it, whether an ox, or sheep, it is Jehovah's.
Exodus 13:2
Sanctify all the first-born to Me, whatever opens the womb among the sons of Israel, of man and of beast. It is Mine.
Exodus 13:12-13
you shall set apart to Jehovah every one that opens the womb, and every first-born that comes of any animal which you have; the males shall be Jehovah's.
Exodus 22:30
Likewise you shall do with your oxen and with your sheep; it shall be with its dam seven days. On the eighth day you shall give it to Me.
Numbers 18:17
But the first-born of a cow, or the first-born of a sheep, or the first-born of a goat, you shall not redeem. They are holy. You shall sprinkle their blood upon the altar, and shall burn their fat, an offering made by fire, for a sweet savor to Jehovah.
Deuteronomy 15:19
All the first-born males that come from your herd and from your flock, you shall set apart to Jehovah your God. You shall do no work with the first-born of your bull, nor shear the first-born of your sheep.