Numbers 3:20-24
English Standard Version
21To Gershon belonged the clan of the Libnites and the clan of the Shimeites; these were the clans of the Gershonites.
22Their listing according to the number of all the males from a month old and upward was 7,500.
23The clans of the Gershonites were to camp behind the tabernacle on the west,
24with Eliasaph, the son of Lael as chief of the fathers ' house of the Gershonites.