Leviticus 27:26
Only the firstling of the animals, which should be the LORD'S firstling, no man may dedicate it; whether it be ox, or sheep: it is the LORD'S.
Exodus 13:2
Sanctify unto me all the firstborn, whatsoever opens the womb among the children of Israel, both of man and of beast: it is mine.
Exodus 13:12-13
That you shall set apart unto the LORD all that opens the womb, and every firstling that comes of a beast which you have; the males shall be the LORD'S.
Exodus 22:30
Likewise shall you do with your oxen, and with your sheep: seven days it shall be with its mother; on the eighth day you shall give it to me.
Numbers 18:17
But the firstling of a cow, or the firstling of a sheep, or the firstling of a goat, you shall not redeem; they are holy: you shall sprinkle their blood upon the altar, and shall burn their fat for an offering made by fire, for a sweet aroma unto the LORD.
Deuteronomy 15:19
All the firstborn males that come of your herd and of your flock you shall sanctify unto the LORD your God: you shall do no work with the firstborn of your bullock, nor shear the firstborn of your sheep.