Numbers 18:21–30

²¹“I am giving the Levites one-tenth of every Israelite’s income. This is in return for the work they do at the tent of meeting. ²²The other Israelites must never again come near the tent of meeting. Otherwise, they’ll suffer the consequences of their sin and die. ²³Only the Levites will do the work at the tent of meeting. They will be responsible for their own sins. This is a permanent law for future generations. They will own no property as the other Israelites will. 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. ²⁷Your contribution will be considered to be grain from the threshing floor^bor juice from the winepress. ²⁸So you, too, will contribute one-tenth of your income to the Lord out of all that you receive from the Israelites’ income. You will give the Lord’s contribution to the priest Aaron. ²⁹Out of all the gifts you receive, you must contribute the best and holiest parts to the Lord. 

³⁰“Also tell them: When you contribute the best part, your contribution will be considered to be produce from the threshing floor or winepress.