John Gill Commentary 1 Chronicles 6:48

"And their brethren the Levites were appointed for all the service of the tabernacle of the house of God." — 1 Chronicles 6:48 (ASV)

Their brethren also the Levites
Who were not skilled in singing, and employed in that service, even the rest of the Kohathites, Gershonites, and Merarites:

were appointed unto all manner of service of the tabernacle of the
house of God ;
some were porters at the gates; others had the care of the vessels; others slew the beasts for sacrifices, flayed them, and cut them up, and brought the pieces to the altar of burnt offerings, for the priests to offer.