Numbers 18:27-30

MLV(i) 27 And your* heave offering will be reckoned to you*, as though it were the grain of the threshing-floor and as the fullness of the winepress. 28 Thus you* also will offer a heave offering to Jehovah of all your* tithes, which you* receive of the sons of Israel. And from it you* will give Jehovah's heave offering to Aaron the priest. 29 Out of all your* gifts you* will offer every heave offering of Jehovah, of all the best of it, even the holy part of it out of it.
30 Therefore you will say to them, When you* heave the best of it from it, then it will be reckoned to the Levites as the increase of the threshing-floor and as the increase of the wine-press.