Joshua 21:10
Which the children of Aaron, being of the families of the Kohathites, who were of the children of Levi, had: for theirs was the first lot.
Cross-reference
Joshua 21:4 provides the full list for the first lot of Kohathites, which verse 10 summarizes as belonging to Aaron's descendants.
Exodus 6:18 gives the genealogy of Kohath, establishing the lineage of Aaron's family who received this first lot.
Exodus 6:20-26 gives the genealogy of Aaron and Moses, showing the Aaronic priests descended from Kohath, matching the priestly lineage here.
Numbers 3:2-4 lists Aaron's sons, including Nadab and Abihu who died, establishing the priestly families that inherit cities here.
Numbers 3:19 lists the four Kohathite clans—Amram, Izhar, Hebron, Uzziel—from which the Aaronite priests come.
Numbers 3:27 repeats the same four Kohathite families, confirming the clan structure referenced here for the first lot.
Numbers 4:2 commands a census of the Kohathites, linking to the same tribal group mentioned here as recipients of the first lot.