26 But no one may consecrate a firstborn of the livestock, because a firstborn belongs to the LORD. Whether it is an ox or a sheep, it is the LORD’s.
Leviticus 27:26 Cross References - BSB
Exodus 13:2
2 “Consecrate to Me every firstborn male. The firstborn from every womb among the Israelites belongs to Me, both of man and beast.”
Exodus 13:12-13
Exodus 22:30
30 You shall do likewise with your cattle and your sheep. Let them stay with their mothers for seven days, but on the eighth day you are to give them to Me.
Numbers 18:17
17 But you must not redeem the firstborn of an ox, a sheep, or a goat; they are holy. You are to sprinkle their blood on the altar and burn their fat as an offering made by fire, a pleasing aroma to the LORD.
Deuteronomy 15:19
19 You must set apart to the LORD your God every firstborn male produced by your herds and flocks. You are not to put the firstborn of your oxen to work, nor are you to shear the firstborn of your flock.