We will also bring the first of our coarse meal, of our contributions, of the fruit of every tree, of new wine, and of olive oil to the priests at the storerooms of the temple of our God, along with a tenth of the produce ¹  of our land to the Levites, for the Levites are the ones who collect the tithes in all the cities where we work. ² 

So in the days of Zerubbabel and in the days of Nehemiah, all Israel was contributing the portions for the singers and gatekeepers, according to the daily need. ¹  They also set aside ²  the portion for the Levites, and the Levites set aside the portion for the descendants of Aaron.

Then I directed the Levites to purify themselves and come and guard the gates in order to keep the Sabbath day holy. For this please remember me, O my God, and have pity on me in keeping with your great love.