Thematic Bible: Bound to give a tenth of their tithes to the priests

And you shall speak to the Levites, and you shall say to them, When you take tithes from the sons of Israel, which I have given you from them for your inheritance, then you shall offer up a heave offering of it for Jehovah, a tenth of the tithe. And your heave offering shall be credited to you as grain of the threshing-floor, and as the fullness of the winepress. So you also shall offer a heave offering to Jehovah of all your tithes which you receive from the sons of Israel. And you shall give from it Jehovah's heave offering to Aaron the priest. read more.
Out of all your gifts you shall offer every heave offering of Jehovah, of all its fat, the holy part of it out of it. And you shall say to them, When you have lifted up its fat, then it shall be credited to the Levites as the increase of the threshing-floor, and as the increase of the winepress. And you shall eat it in every place, you and your households. For it is your reward for your service in the tabernacle of the congregation. And you shall bear no sin because of it, when you have lifted up the fat of it. Neither shall you defile the holy things of the sons of Israel, lest you die.