Numbers 18:21-28

21The Israelites give to me one tenth of everything that they receive. I will give it to the Levites because they serve me in the Tent of Meeting.

22The other Israelites must not come near the Tent of Meeting again. If they do come near it, they will be guilty and then they will die.

23Only the Levites must do the work in the Tent of Meeting. And if they do anything wrong there, they will be guilty. That will be a rule for you and for all your descendants. The Levites will not receive any land like the other Israelites do.

24That is because I have given to the Levites the tithes that the Israelites offer to the Lord. I have told them, “You will not receive any land, like the other Israelites do.” I have given the tithes to them instead.’

25The Lord said to Moses,

26‘You must say to the Levites, “You will receive from the Israelites the tithe that I have given to you from them. I have not given any land to you. I have given the tithes to you instead. When you receive those tithes, you must offer one tenth of it to the Lord. That will be a tithe of the tithe.

27This gift will be the same as when a farmer is giving grain or wine to me. It will be special.

28So you will give something to the Lord from the tithes that you receive from the Israelites. You must give that part to Aaron the priest.