Exodus 38:21

“a beka each, that is, half an ounce, according to the sanctuary shekel, from everyone who had crossed over to those counted, twenty years old or more, a total of 603,550 men.”

Continues the discussion of the census tax and materials used.

“Appoint the Levites to be in charge of the tabernacle of the Testimony—over all its furnishings and everything else belonging to it. They are to carry the tabernacle and all its furnishings; they are to take care of it and encamp around it.”

Relates to the responsibilities of the Levites in managing the tabernacle.

“They are to perform duties for him and for the whole community at the tent of meeting by doing the work of the tabernacle.”

Describes the duties the Levites are to perform related to the tabernacle.

“This was the service of the Gershonite clans at the tent of meeting. Their duties were under the direction of Ithamar son of Aaron, the priest.”

Continues the theme of assigning responsibilities for the tabernacle's care and maintenance.

“These were the descendants of Levi by their families—the heads of families as they were registered under their names and counted individually, that is, the men twenty years old or more—who served in the house of the LORD.”

Discusses the organization and registration of Levites for service related to the house of the Lord.