Ezra 3:8

In the second year after their coming to the house of God at Jerusalem, in the second month, Zerubbabel son of Shealtiel and Jeshua son of Jehozadak began their work, and the remainder of their brothers the priests and the Levites and all who came from the captivity to Jerusalem. They appointed the Levites from twenty years and older to direct the work of the house of Yahweh.