Bede

And Joshua stood and his sons, etc. In this place, Joshua does not refer to the son of Josedek, the high priest, but to one of the Levites, of whom it had been foretold that they would be appointed from twenty years old and above to attend to the work of the Lord, among whom were also Kadmiel and the sons of Henadad, who were recorded as having taken heed of the same work, along with their sons and brothers; indeed, earlier in the catalogue of the people of Israel, these, after the priests, are the first Levites mentioned by name. …

Commentary on Ezra and Nehemiah ↗