Why is it necessary to command Aharon with such apparent urgency? Could this be a form of special encouragement  to encourage people to bring korbanot? But if so, why would it be directed at the Kohamim?

Delving into this question about offering allows us to appreciate the monetary challenges of bringing an offering. But is that, something that seems to be more of a challenge for non-Kohanim, really what’s going on here? Or is it about  a very different type of challenge for Aharon?