Numbers 18:10

7 And you and your sons with you are to be responsible as priests for the altar and everything on it, and everything inside the veil; you are to do the work of priests; I have given you your position as priests; and any other man who comes near will be put to death.

8 And the Lord said to Aaron, See, I have given into your care my lifted offerings; even all the holy things of the children of Israel I have given to you and to your sons as your right for ever, because you have been marked with the holy oil.

9 This is to be yours of the most holy things, out of the fire offerings; every offering of theirs, every meal offering and sin-offering, and every offering which they make on account of error, is to be most holy for you and your sons.

10 As most holy things they are to be your food: let every male have them for food; it is to be holy to you.

11 And this is yours: the lifted offering which they give and all the wave offerings of the children of Israel I have given to you and to your sons and to your daughters as your right for ever: everyone in your house who is clean may have them for food.

12 All the best of the oil and the wine and the grain, the first-fruits of them which they give to the Lord, to you have I given them.

13 The earliest produce from their land which they take to the Lord is to be yours; everyone in your house who is clean may have it for his food.