Numbers 16:15 - Matthew Poole's English Annotations on the Holy Bible

Moses was very wroth, not so much for his own sake, for he had learnt to bear indignities, Num 12, as for God's sake, who was highly dishonoured, blasphemed, and provoked by these speeches and carriages, in which case he ought to be angry, as Christ was, Mark 3:5. Respect not thou their offering, i.e. accept not their incense which they are now going to offer, but show some eminent dislike of it. He calls it their offering, though it was offered by Korah and his companions, because it was offered in the name and by the consent of all the conspirators, for the decision of the present controversy between them and Moses. Not one ass, i.e. not any thing of the smallest value, as an ass was; see 1 Samuel 12:3 neither have I injured them, nor used my power to defraud or oppress them, as I might have done; but, which is here implied, I have done them many good offices, but no hurt; therefore their crime is inexcusable, because without any cause or provocation on my part.