“Speak to the Levites and say to them: ‘When you receive from the Israelites the tithe I give you as your inheritance, you must present a tenth of that tithe as the Lord’s offering.
A priest descended from Aaron is to accompany the Levites when they receive the tithes, and the Levites are to bring a tenth of the tithes up to the house of our God, to the storerooms of the treasury.
The people of Israel, including the Levites, are to bring their contributions of grain, new wine and olive oil to the storerooms, where the articles for the sanctuary and for the ministering priests, the gatekeepers and the musicians are also kept. “We will not neglect the house of our God.”
Now the law requires the descendants of Levi who become priests to collect a tenth from the people—that is, from their fellow Israelites—even though they also are descended from Abraham.