They set the priests - Or, according to another reading, “The priests stood.”
The Levites the sons of Asaph - i. e., “such of the Levites as were descendants of Asaph.” It would seem as if no descendants of Heman or Jeduthun had returned.
Related Commentaries of Ezra 3:10
Ezra 3:10
10 And when the builders laid the foundation of the temple of the LORD, they set the priests in their apparel with trumpets, and the Levites the sons of Asaph with cymbals, to praise the LORD, after the ordinance of David king of Israel.