Numbers 18:30-32

30“Say to them: When you present the best part, it will be reckoned to the Levites as the produce of the threshing floor and of the winepress.

31You and your household may eat it in any place. It is your wage for your service in the Tent of Meeting.

32“In presenting the best part in this manner, you will bear no guilt in these matters. You will not defile the holy things of Bnei-Yisrael, so you will not die.”