Numbers 18:24-26

24Instead, I will give the Levites what the Israelites contribute to the Lord—one-tenth of the Israelites’ income. This is why I said about them, ‘They will own no property as the other Israelites do.’ ”

25The Lord said to Moses,

26“Speak to the Levites and say to them: You will take one-tenth of the Israelites’ income which I’m giving you as your property. When you do, you must contribute one-tenth of that income as your contribution to the Lord.