Numbers 3:19-23 English Standard Version (ESV)

19. And the sons of Kohath by their clans: Amram, Izhar, Hebron, and Uzziel.

20. And the sons of Merari by their clans: Mahli and Mushi. These are the clans of the Levites, by their fathers’ houses.

21. To Gershon belonged the clan of the Libnites and the clan of the Shimeites; these were the clans of the Gershonites.

22. Their listing according to the number of all the males from a month old and upward was 7,500.

23. The clans of the Gershonites were to camp behind the tabernacle on the west,

Numbers 3