Rashi on Numbers 26:58/רש"י על במדבר כ״ו:נ״ח

1אלה משפחת לוי THESE ARE THE FAMILIES OF LEVI — there are missing here the families of Shimei and Uzziel and part of that of Jizhar (cf. Exodus 6:16 ff. and Rashi on v. 13).