ואת האש זרה הלאה, not on the place where the remains of burned offerings were stacked on the altar. The reason was that it was incense that should never have been allowed into the precincts of the Tabernacle.

כי קדשו, for only the pans had become holy so that they could not be treated with disrespect.

כי הקריבום לפני ה' ויקדשו, they had become sanctified as vessels used for service for the Lord except if used of unauthorised service. This fact qualified these copper pans to be used as an overlay on the copper altar.

'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.

ויעמוד בין המתים ובין החיים, after he had already reached that spot he waited in order to help cure the ones who had taken sick but had not died yet. Instead of distancing himself from the congregation of sinners (verse 21) Aaron did the opposite in order to save whom he could save.

ותעצר המגפה. Not a single Israelite was struck by the pestilence from that moment on.

ותעצר המגפה. Not a single Israelite was struck by the pestilence from that moment on.

ויראו ויקחו איש מטהו. So there will be an indication for their tribe.

This was the reminder for all times, a miracle which silenced their complaints forthwith.