The fields of the city - gave they to Caleb - This was an exclusive privilege to him and his family, with which the grant to the Levites did not interfere. See the notes on Joshua 14:14.

they gave

1 Chronicles 6:56 But the fields of the city, and the villages thereof, they gave to Caleb the son of Jephunneh.

Hebron

Joshua 15:54 And Humtah, and Kirjatharba, which is Hebron, and Zior; nine cities with their villages:

a city

Joshua 20:7 And they appointed Kedesh in Galilee in mount Naphtali, and Shechem in mount Ephraim, and Kirjatharba, which is Hebron...

Numbers 35:6 And among the cities which you shall give to the Levites there shall be six cities for refuge, which you shall appoint for the manslayer...

Libnah

Joshua 10:29 Then Joshua passed from Makkedah, and all Israel with him, to Libnah, and fought against Libnah:

Joshua 15:42 Libnah, and Ether, and Ashan,

1 Chronicles 6:57 And to the sons of Aaron they gave the cities of Judah, namely, Hebron, the city of refuge, and Libnah with her suburbs, and Jattir...

Isaiah 37:8 So Rabshakeh returned, and found the king of Assyria warring against Libnah: for he had heard that he was departed from Lachish.

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