Numbers 18:30-32

30And you shall say to them, ‘When you have 1offered from it the best of it, then the rest shall be credited to the Levites like the product of the threshing floor, and like the product of the wine vat.

31You may eat it anywhere, you and your households, for it is your compensation in return for your service in the tent of meeting.

32And you will bring on yourselves no sin by reason of it when you have 2offered the 3best of it. But you shall not 4profane the sacred gifts of the sons of Israel, so that you do not die.’”