Charles Ellicott Commentary Ezra 3:9

"Then stood Jeshua with his sons and his brethren, Kadmiel and his sons, the sons of Judah, together, to have the oversight of the workmen in the house of God: the sons of Henadad, with their sons and their brethren the Levites." — Ezra 3:9 (ASV)

Together — As one man. Jeshua and Kadmiel, both of the stock of Judah, or Hodaviah (Ezra 2:40), or Hodevah (Nehemiah 7:43), were the two heads of Levitical families; and their small number is compensated by their unanimity and vigour. Henadad is not mentioned in Ezra 2:40, though it is a Levitical name in Nehemiah. Why omitted there, or why inserted here, it is not possible to determine.