Leviticus 27:25-27

New Revised Standard Version, Anglicised Catholic Edition

²⁵ All assessments shall be by the sanctuary shekel: twenty gerahs shall make a shekel.

²⁶ A firstling of animals, however, which as a firstling belongs to the Lord, cannot be consecrated by anyone; whether ox or sheep, it is the Lord’s. ²⁷ If it is an unclean animal, it shall be ransomed at its assessment, with one-fifth added; if it is not redeemed, it shall be sold at its assessment.