Rashi on Numbers 17:2/רש"י על במדבר י״ז:ב׳

1ואת האש AND THE FIRE — that is in the censers (not, as might be assumed, that of the burning materials — the שרפה just mentioned).

2זרה הלאה SCATTER YONDER on the ground from off the censers.

3כי קדשו FOR THEY — the censers — ARE HALLOWED, and are therefore forbidden for any profane use, since they have made them into “vessels of service” (כלי שרת) (by using them for offering incense).