'Groups' in the Bible

the clans of Kiriath Jearim -- the Ithrites, Puthites, Shumathites, and Mishraites. (The Zorathites and Eshtaolites descended from these groups.)

David consulted with his military officers, including those who led groups of a thousand and those who led groups of a hundred.

David divided them into groups corresponding to the sons of Levi: Gershon, Kohath, and Merari.

David, Zadok (a descendant of Eleazar), and Ahimelech (a descendant of Ithamar) divided them into groups to carry out their assigned responsibilities.