As for the sons of Merari The third and youngest son of Levi:
thou shalt number them after their families, by the house of their fathers; which is the form of expression used of them all; (See Gill on Numbers 4:2).
27
"All of their work must be done under the direction of Aaron and his sons. That includes carrying and everything else they do. Aaron and his sons must tell them what to carry. And that will be their work.
28
It is what the Gershon families must do at the Tent of Meeting. They must work under the direction of the priest Ithamar. He is the son of Aaron.
29
"Count the Merari families. Count them family by family.
30
Count all of the men who are from 30 to 50 years old. Those are the men who must come and serve at the Tent of Meeting.
31
"Here is the work they must do at the Tent of Meeting. They must carry the frames of the holy tent. They must carry its crossbars, posts and bases.