Leviticus 27:26
Only the firstling of the beasts, which should be the LORD'S firstling, no man shall sanctify it; whether ox, or sheep: it is the LORD'S.
Exodus 13:2
Sanctify to me all the first-born, whatever openeth the womb among the children of Israel, both of man and of beast: it is mine.
Exodus 13:12-13
That thou shall set apart to the LORD all that openeth the matrix; and every firstling that cometh of a beast which thou hast, the males shall be the LORD'S.
Exodus 22:30
Likewise shalt thou do with thy oxen, and with thy sheep: seven days it shall be with his dam; on the eighth day thou shalt 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, thou shalt not redeem; they are holy: thou shalt sprinkle their blood upon the altar, and shalt burn their fat for an offering made by fire, for a sweet savor to the LORD.
Deuteronomy 15:19
All the firstling males that come of thy herd and of thy flock thou shalt sanctify to the LORD thy God: thou shalt do no work with the firstling of thy bullock, nor shear the firstling of thy sheep.