Joshua 21:10

10 to the descendants of Aaron who were of the clan of Kohath, which was descended from Levi. Their assignment was the first to be made.

Joshua 21:10 Meaning and Commentary

Joshua 21:10

Which the children of Aaron, [being] of the families of the
Kohathites
Who descending from Kohath, in the line of Aaron, were priests:

[who were] of the children of Levi, had;
they were Levites, as descending from Levi, but were priests also, as being of the stock of Aaron, and the cities hereafter mentioned in the said tribe fell to their portion:

for theirs was the first lot;
for being of the line of Aaron, and priests, they had the honour and privilege to have the first lot drawn for them, and out of the tribe for which the first lot was also drawn, the tribe of Judah; here they had their cities allotted them, for a reason before given.

Joshua 21:10 In-Context

8 By drawing lots, the people of Israel assigned these cities and their pasture lands to the Levites, as the Lord had commanded through Moses.
9 These are the names of the cities from the territories of Judah and Simeon which were given
10 to the descendants of Aaron who were of the clan of Kohath, which was descended from Levi. Their assignment was the first to be made.
11 They were given the city of Arba (Arba was Anak's father), now called Hebron, in the hill country of Judah, along with the pasture land surrounding it.
12 However, the fields of the city, as well as its towns, had already been given to Caleb son of Jephunneh as his possession.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.