John Gill Commentary Numbers 4:9

"And they shall take a cloth of blue, and cover the candlestick of the light, and its lamps, and its snuffers, and its snuffdishes, and all the oil vessels thereof, wherewith they minister unto it:" — Numbers 4:9 (ASV)

And they shall take a cloth of blue, and cover the candlestick
of the light, and his lamps
Which had lamps in it, and were continually lighted, and gave light in the holy place:

and his tongs, and his snuff dishes, and all the oil vessels thereof ,
wherewith they minister unto it ;
by supplying the lamps with oil, and snuffing and trimming them.