Diḇre haYamim Bĕt (2 Chronicles) 8:14

And according to the ruling of Dawiḏ his father, he appointed the divisions of the priests for their service, the Lĕwites for their duties, to praise and serve before the priests, as the duty of each day required, and the gatekeepers by their divisions at each gate, for so was the command of Dawiḏ the man of Elohim.