Charles Ellicott 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. — that is, the Levites who were not musicians — the remaining Levites.

Appointed. — literally, given — that is, to Aaron and his sons as their assistants; Numbers 3:9 (Heb.), And thou shalt give the Levites to Aaron and to his sons, given are they to him from amongst the sons of Israel. The word is nethûnîm. (Compare nethînim, an identical form, as the name of a well-known class of Temple-servants.)

Tabernacle. — rather, dwelling-place (mishkan).