Nehemiah 12:45-47
45 They performed the service of their God and the service of purification, as did also the singers and gatekeepers, according to the commands of David and his son Solomon.
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 thanksgiving to God.
47 So in the days of Zerubbabel and of Nehemiah, all Israel contributed the daily portions for the singers and gatekeepers. They also set aside the portion for the other Levites, and the Levites set aside the portion for the descendants of Aaron.