On that same day men were placed in charge of the rooms [that housed] the supplies, contributions, firstfruits, and tenths. The legally required portions for the priests and Levites were gathered from the village fields, because Judah was grateful to the priests and Levites who were serving.
References for Nehemiah 12:44
They performed the service of their God and the service of purification, along with the singers and gatekeepers, as David and his son Solomon had prescribed.
For long ago, in the days of David and Asaph, there were leaders of the singers and songs of praise and thanksgiving to God.
References for Nehemiah 12:46
So in the days of Zerubbabel and Nehemiah, all Israel contributed the daily portions for the singers and gatekeepers. They also set aside daily portions for the Levites, and the Levites set aside daily portions for the descendants of Aaron.