Leviticus 27:26-27 ▼

26 But no one can consecrate a firstborn of the livestock, whether an animal from the herd or flock, to the LORD, because a firstborn already belongs to the LORD.

27 If it is one of the unclean livestock, it must be ransomed according to your assessment by adding a fifth of its value to it. If it is not redeemed, it can be sold according to your assessment.”