C. F. Keil and Franz Delitzsch on 1 Chronicles 26:12

1Ch 26:12

The division of the doorkeepers according to their posts of service. 1Ch 26:12. “To these classes of doorkeepers, viz., to the heads of the men, (were committed) the watches, in common with their brethren, to serve in the house of Jahve.” By מחלקות לאלּה it is placed beyond doubt that the above-mentioned names and numbers give us the classes of the doorkeepers. By the apposition הגּברים לראשׁי, the meaning of which is discussed in the commentary on 1Ch 24:4, השׁ מחלקות is so defined as to show that properly the heads of the households are meant, only these having been enumerated in the preceding section, and not the classes.