Numbers 18:24-32

MLV(i) 24 For the tithe of the sons of Israel, which they offer as a heave offering to Jehovah, I have given to the Levites for an inheritance. Therefore I have said to them, Among the sons of Israel they will have no inheritance.
25 And Jehovah spoke to Moses, saying, 26 Moreover you will speak to the Levites and say to them, When you* take from the sons of Israel the tithe which I have given you* from them for your* inheritance, then you* will offer up a heave offering of it for Jehovah, a tithe of the tithe. 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. 31 And you* will eat it in every place, you* and your* households, for it is your* reward in return for your* service in the tent of meeting. 32 And you* will bear no sin by reason of it, when you* have heaved from it the best of it. And you* will not profane the holy things of the sons of Israel, that you* not die.