Rashi on Numbers 1:51/רש"י על במדבר א׳:נ״א

1יורידו אתו [AND WHEN THE DWELLING SETTETH FORWARD] THE LEVITES SHALL TAKE IT DOWN — Understand יורידו as the Targum does: they shall take it apart. Whenever they were about to set out on a journey in the wilderness from one station to another (cf. Rashi Exodus 40:38) they took the structure apart (lit., they took it apart from its state of being put up) and carried it to the place where the cloud afterwards abode, and there they encamped and erected it (the Tabernacle).

2והזר הקרב AND THE LAYMAN THAT COMETH NIGH to this service of theirs,

3יומת SHALL BE PUT TO DEATH by heaven (not by sentence of the court) (cf. Sanhedrin 84a).