Since the watch of the temple had hitherto been kept by porters, singers, and Levites 1 Chronicles 26:1-19, so now the watch of the entire city was committed to men of the same three classes, their experience pointing them out as the most suitable persons.
Related Commentaries of Nehemiah 7:1
Nehemiah 7:1
1 Now it came to pass, when the wall was built, and I had set up the doors, and the porters and the singers and the Levites were appointed,