Leviticus 27:26, 27
Leviticus 27:26 NIV
“ ‘No one, however, may dedicate the firstborn of an animal, since the firstborn already belongs to the LORD; whether an ox or a sheep, it is the LORD’s.
Leviticus 27:27 NIV
If it is one of the unclean animals, it may be bought back at its set value, adding a fifth of the value to it. If it is not redeemed, it is to be sold at its set value.