Jamieson, Fausset & Brown, on Neh 12:44

“And they kept the watch of their God, and the observance of expiation, and the singing men, and the porters, according to the commandment of David, and of Solomon his son.”

“portions of the law--that is, "prescribed by the law." for Judah rejoiced for the priests and . . . Levites that waited--The cause of this general satisfaction was either the full restoration of the temple service and the reorganized provision for the permanent support of the ministry, or it was the pious character and eminent gifts of the guardians of religion.”

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