These are the families of the Levites. The three Levitical sub-tribes have been named in the preceding verse, and the present enumeration of families is an independent one. The Libnites were Gershonites (Numbers 3:21), the Hebronites and Korathites (or Korahites) were Kohathites (Numbers 3:19; Numbers 16:1), the Mahlites and Mushites were Merarites (Numbers 3:33).
Two other families, the Shimites (Numbers 3:21) and the Uzzielites (Numbers 3:27; 1 Chronicles 26:23, and cf. Exodus 6:22; 1 Chronicles 24:24, 1 Chronicles 24:25), are omitted here, perhaps because the list is imperfect (see, however, the note on Numbers 26:62).