Numbers 16:16 - Joseph Benson’s Commentary on the Old and New Testaments

Be thou and thy company before the Lord Not in the tabernacle, which was not capable of containing so many persons severally offering incense, but at the door of the tabernacle, where they might offer it by Moses's direction upon this extraordinary occasion. Indeed, this work could not be done in that place, which alone was allowed for the offering up of incense; not only for its smallness, but also because none but priests might enter to do this work. Here also the people, who were to be instructed by this experiment, might see the proof and success of it.