Numbers 18:29-31

Amplified Bible

²⁹ Out of all your gifts, you shall present every offering due to the Lord, from all the best of it, even the sacred part from them.’ ³⁰ Therefore you shall say to them, ‘When you have offered the best from it, then the rest shall be credited to the Levites as the product of the threshing floor, and as the product of the wine vat. ³¹ You may eat it anywhere, you and [the members of] your households, for it is your compensation in return for your service in the Tent of Meeting (tabernacle).