John Gill, on Neh 12:42

“And they sacrificed on that day great sacrifices, and they rejoiced: for God had made them joyful with great joy: their wives also and their children rejoiced, and the joy of Jerusalem was heard afar off.”

“And both the singers and the porters kept the ward of their God, and the ward of their purification,.... The singers kept their turns in course in the temple, and were not wanting to officiate on all occasions, besides morning and evening services; and the porters they diligently kept the gates of the temple, that no impure person or thing in a ceremonial sense entered: according to the commandment of David, and Solomon his son; who made very good rules and orders relative to the better and more regular performance of service by them; see Ch1 25:1.”

Imported from an open dataset — not yet checked against the printed edition.