Numbers 4:15, 24, 31

“After Aaron and his sons have finished covering the holy furnishings and all the holy articles, and when the camp is ready to move, only then are the Kohathites to come and do the carrying. But they must not touch the holy things or they will die. The Kohathites are to carry those things that are in the tent of meeting.

“This is the service of the Gershonite clans in their carrying and their other work

As part of all their service at the tent, they are to carry the frames of the tabernacle, its crossbars, posts and bases