'Ezra (Ezr) 3:8

In the second year after their arrival at the house of God in Yerushalayim, in the second month, Z’rubavel the son of Sh’alti’el, Yeshua the son of Yotzadak, the rest of their kinsmen the cohanim and L’vi’im, and all who had come out of exile to Yerushalayim began the project. They appointed the L’vi’im aged twenty and up to direct work in the house of ADONAI.