Theirs was the lot - All the tribes and families obtained their respective inheritances by lot, but to the sons of Aaron was the first lot; and so the Syriac and Arabic have understood this place. The first lot, says Jarchi, fell to Judah, that they might give to the priests and the Levites the cities marked below. See an account of the possessions of the priests and Levites, Joshua 20:1-9, 21.

Hilen. i.e., fortress or, Holon.

Joshua 15:51 And Goshen, and Holon, and Giloh; eleven cities with their villages:

Joshua 21:15 And Holon with her suburbs, and Debir with her suburbs,

This variation simply arises from the introduction of a {yood}, and a change of the vowel points.

Debir.

Joshua 10:3,38 Why Adonizedec king of Jerusalem, sent to Hoham king of Hebron, and to Piram king of Jarmuth, and to Japhia king of Lachish...

Joshua 12:13 The king of Debir, one; the king of Geder, one;

Joshua 15:49 And Dannah, and Kirjathsannah, which is Debir,

Chronicles
The comparative indifference with which Chronicles is regarded in modern times by all but professional scholars seems to have been shared by the ancient Jewish church. Though written by the same hand as wrote Ezra-Nehemiah, and forming, together with these books, a continuous history of Judah, it is placed after them in the Hebrew Bible, of which it forms the concluding book; and this no doubt points to the fact that it attained canonical distinction later than they. Nor is this unnatural. The book …
John Edgar McFadyen—Introduction to the Old Testament