Cross reference
Leviticus 27:26
26 "'Only the firstborn among animals, which is made a firstborn to Yahweh, no man may dedicate it; whether an ox or sheep, it is Yahweh's.
Exodus 13:2
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
12 that you shall set apart to Yahweh all that opens the womb, and every firstborn which you have that comes from an animal. The males shall be Yahweh's.
13 Every firstborn of a donkey you shall redeem with a lamb; and if you will not redeem it, then you shall break its neck; and you shall redeem all the firstborn of man among your sons.
Exodus 22:30
30 You shall do likewise with your oxen and with your sheep. Seven days it shall be with its mother, then on the eighth day you shall give it me.
Numbers 18:17
17 But the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat, you shall not redeem; they are holy: you shall sprinkle their blood on the altar, and shall burn their fat for an offering made by fire, for a sweet savor to Yahweh.
Deuteronomy 15:19
19 All the firstborn males that are born of your herd and of your flock you shall sanctify to Yahweh your God: you shall do no work with the firstborn of your herd, nor shear the firstborn of your flock.