Numbers 18:28-30

International Standard Version

²⁸ You are to offer a raised offering to the Lord from all your tithes that you receive from the Israelis. Give Aaron the priest the raised offering of the Lord ²⁹ out of all the most consecrated offerings that you receive, that is, all the raised offerings of the Lord, with all its best and the most holy parts of it. ³⁰ Tell them that when they bring the best from it, as far as the descendants of Levi are concerned, it is to be considered like produce from the threshing floors and wine vats.