Thirteen cities with their suburbs - At the time mentioned here certainly thirteen cities were too large a proportion for the priests, as they and their families amounted to a very small number: but this ample provision was made in reference to their great increase in after times, when they formed twenty-four courses, as in the days of David.

Joshua 21:5 And the rest of the children of Kohath had by lot out of the families of the tribe of Ephraim, and out of the tribe of Dan...

1 Chronicles 6:66 And the residue of the families of the sons of Kohath had cities of their coasts out of the tribe of Ephraim.

Divers Matters.
I. Beth-cerem, Nehemiah 3:14. "The stones, as well of the altar, as of the ascent to the altar, were from the valley of Beth-cerem, which they digged out beneath the barren land. And thence they are wont to bring whole stones, upon which the working iron came not." The fathers of the traditions, treating concerning the blood of women's terms, reckon up five colours of it; among which that, "which is like the water of the earth, out of the valley of Beth-cerem."--Where the Gloss writes thus, "Beth-cerem …
John Lightfoot—From the Talmud and Hebraica