Charles Ellicott Commentary 1 Chronicles 6:66

"And some of the families of the sons of Kohath had cities of their borders out of the tribe of Ephraim." — 1 Chronicles 6:66 (ASV)

And the residue of the families. —The Hebrew text can hardly mean this; and Joshua 21:20 shows that it is incorrect. The original text must have been, “And to the families of the sons of Kohath:—and the cities of their border were of the tribe of Ephraim.” The construction breaks off, and a new start is made by the words “and the cities,” etc. The verse is abridged as compared with Joshua.