John Calvin Reformed @genevareformer

4. And when Moses heard it, he fell upon his face. There is no doubt but that he had recourse to prayer in his perplexity, since he knew that the remedy for so great an evil was only in the hand of God.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. An account of the rebels, who and what they were, not, as formerly, the mixed multitude and the dregs of the people, who are therefore never named, but men of distinction and quality, that made a figure. Korah was the ring-leader: he formed and headed the faction; therefore it is called the gainsaying of Korah, Jde 1:11.

Commenting on Numbers 16:1-11

John Gill Reformed Baptist @doctorgill

And when Moses heard it,.... What they said, their complaint against him, for setting up Aaron for an high priest, and against Aaron for taking this honour to himself: he fell upon his face; through shame, as the Targum of Jonathan, blushing at their sin, in opposing the ordinance of God; and through fear of the divine displeasure, and of the wrath of God coming...