John Calvin on Exodus 16:2-3

2. And the whole congregation. Moses says not that some of the people only murmured, but that they were all gathered into mobs as in a conspiracy, or, at any rate, as they were arranged by hundreds and thousands, that they murmured with one consent. Yet the universal term admits of exception; nor need we suppose that all to a man were comprehended in this impious rebellion. The best remedy for their hunger would have been to pray to God, whom they had found to be in all respects a bountiful Father, and whom they had heard to have wonderfully provided for their parents, when the Egyptians and inhabitants of Canaan were wasting with hunger in such rich and fertile places. If they had only been persuaded that the earth is made fertile by God’s blessing, it would at the same time have occurred to them, that it is His peculiar office to feed the hungry, and immediately they would have directed their prayers to Him; now, their unbelief betrays itself in their turbulent clamor. It is indeed astonishing that wretched men, whom their necessity should have humiliated, rose insolently against God, and that their hunger, so far from bending their hearts to gentleness, was the very incentive of their arrogance. But this is too common with the wicked, (because they do not trust that God is reconciled to them,) to neglect prayer, and to cry out in confusion, to utter their curses, and to rush, like mad dogs, furiously here and there. This was the case of the Israelites in the wilderness of Sin. The want of all things, which presents itself to them, is an invitation to them from God, that they may feel His power, by which He created the world out of nothing, to be independent of all foreign assistance for the maintenance of mankind. But despair seizes upon their faithless minds, so that they reject His aid and beneficence. And not only so, but their malignity and ingratitude instigates them to quarrel with Moses; and this is the sum of their complaint, that they were dragged away from abundance of bread and meat, that they might perish in the desert of hunger. Therefore they call Moses and Aaron, by whose hand and means they had been delivered, their murderers.