Charles Ellicott Commentary 1 Chronicles 6:54

"Now these are their dwelling-places according to their encampments in their borders: to the sons of Aaron, of the families of the Kohathites (for theirs was the [first] lot)," — 1 Chronicles 6:54 (ASV)

Translate as, “And these were their dwelling places according to their encampments within their border.” This, as the heading to all that follows, should be set apart from it. It does not occur in Joshua 21:0 and may indicate an intermediate source used by the chronicler. The variant spellings of proper names, many of which are not mere copyists’ blunders, point in the same direction.

Of the sons of Aaron.—Rather, “to the sons of Aaron, of the clan of the Kohathites—for to them had fallen the lot—they gave to them Hebron,” etc. Joshua 21:10 has, “for to them the lot had fallen first.”