Numbers 3:21
Of Gershon was the family of the Libnites, and the family of the Shimites: these are the families of the Gershonites.
Cross-reference
Numbers 4:22
Parallel
Numbers 4:22 commands a census of the Gershonites, directly following the family listing in 3:21 and detailing their duties.
Joshua 21:6
Historical context
Joshua 21:6 records the land inheritance of the Gershonite clans – a direct historical continuation of the genealogy.
1 Chronicles 6:17
Parallel
1 Chronicles 6:17 repeats the Gershonite sons Libni and Shimei – confirming the same lineage.