Numbers 18:28-30

New Revised Standard Version Catholic Edition

²⁸ Thus you also shall set apart an offering to the Lord from all the tithes that you receive from the Israelites; and from them you shall give the Lord’s offering to the priest Aaron. ²⁹ Out of all the gifts to you, you shall set apart every offering due to the Lord; the best of all of them is the part to be consecrated. ³⁰ Say also to them: When you have set apart the best of it, then the rest shall be reckoned to the Levites as produce of the threshing floor, and as produce of the wine press.