Numbers 18:25-27

New Revised Standard Version, Anglicised Catholic Edition

²⁵ Then the Lord spoke to Moses, saying: ²⁶ You shall speak to the Levites, saying: When you receive from the Israelites the tithe that I have given you from them for your portion, you shall set apart an offering from it to the Lord, a tithe of the tithe. ²⁷ It shall be reckoned to you as your gift, the same as the grain of the threshing-floor and the fullness of the wine press.