Nehemiah 12:44--13:3

12:44 On that day men were appointed over the storerooms for the contributions, first fruits, and tithes, to gather into them from the fields of the cities the portions prescribed by the law for the priests and the Levites, for the people of Judah took delight in the priests and Levites who were ministering. 12:45 They performed the service of their God and the service of purification, along with the singers and gatekeepers, according to the commandment of David and his son Solomon. 12:46 For long ago, in the days of David and Asaph, there had been directors for the singers and for the songs of praise and thanks to God. 12:47 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. They also set aside the portion for the Levites, and the Levites set aside the portion for the descendants of Aaron.

Further Reforms by Nehemiah

13:1 On that day the book of Moses was read aloud in the hearing of the people. They found written in it that no Ammonite or Moabite may ever enter the assembly of God, 13:2 for they had not met the Israelites with food and water, but instead had hired Balaam to curse them. (Our God, however, turned the curse into blessing.) 13:3 When they heard the law, they removed from Israel all who were of mixed ancestry.