Leviticus 27:25-27

Amplified Bible

²⁵ Every valuation of yours shall be in accordance with the sanctuary shekel; twenty gerahs shall make a shekel.

²⁶ ‘However, the firstborn among animals, which as a firstborn belongs to the Lord, no man may consecrate, whether an ox or a sheep. It is [already] the Lord’s. ²⁷ If it is among the unclean animals, the owner may redeem it in accordance with your valuation, and add one-fifth to it; or if it is not redeemed, then it shall be sold in accordance with your valuation.