נחמיה, פרק ז׳, פסוק א׳

Once the construction of the city wall concluded and its doors were securely in place, the city finally stood fortified. This newfound security allowed the people to shift their focus from physical building to internal organization, marking a transition into a period of establishing order and assigning formal responsibilities.

During the intense period of construction, the Levites were entirely consumed by the physical labor of rebuilding the wall. Only after the completion of this massive project were they finally free to return to their regular duties [מלבי״ם]. They were now officially appointed to their posts, taking on their formal responsibilities once again.

The primary approach among commentators is that this stage marks the careful division of the Levites into their specific roles within the Temple service. They were organized precisely, with some assigned to serve as gatekeepers and others as singers, each person given an exact task. Meanwhile, the rest of the Levites took on various other management and administrative positions within the Temple complex, such as overseeing the treasuries [מצודת דוד].