Sforno on Numbers 17:6/ספורנו על במדבר י״ז:ו׳

1'אתם המתם את עם ה, by telling all these people to test G’d by offering incense, something that is only fit to be offered together with the public burnt-offering burned on the altar every day in the morning and evening by the individual priest performing that service. If you wanted to make such a test you should have done so with meat offerings, a procedure in which a large number of priests can participate.