Numbers 4:24-28

This is the service of the families of the Gershonites, to serve, and for burdens:

This is the service ... They were appointed to carry "the curtains of the tabernacle" - i:e., the goats' hair covering of the tent-the ten curious curtains and embroidered hangings at the entrance, with their red morocco covering, etc.

Verse 28. Their charge shall be ... The Levites were subject to the official command of the priests generally in doing the ordinary work of the tabernacle. But during the journeyings Eleazar, who was next in succession to his father, took the special charge of the Kohathites, while his brother Ithamar had the superintendence of the Gershonites and Merarites.