Rashi on Numbers 4:15/רש"י על במדבר ד׳:ט״ו

1לכסת את הקדש [AND AARON AND HIS SONS FINISHED] COVERING THE HOLY THINGS — the Ark and the altar,

2ואת כל כלי הקדש AND ALL THE VESSELS OF THE SANCTUARY — the candelabrum and the vessels for service,

3ומתו [SO THAT THEY SHALL NOT TOUCH ANY THING OF HOLINESS] LEST THEY DIE — because if they do touch they become liable to death by Heaven.