Numbers 18:29-31

Out of all your gifts ye shall offer every heave offering of the LORD, of all the best thereof, {even} the hallowed part thereof out of it. {best: Heb. fat} Therefore thou shalt say unto them, When ye have heaved the best thereof from it, then it shall be counted unto the Levites as the increase of the threshingfloor, and as the increase of the winepress. {best: Heb. fat} And ye shall eat it in every place, ye and your households: for it {is} your reward for your service in the tabernacle of the congregation.