Matthew Henry on Numbers 14:36-39

Here is the sudden death of the ten evil spies. They sinned in bringing a slander upon the land of promise. Those greatly provoke God, who misrepresent religion, raise dislike in men's minds toward it, or give opportunity to those to do so, who seek occasion. Justly are murmurers made mourners. If they had mourned for the sin, when they were faithfully reproved, the sentence had been prevented; but as they mourned for the judgment only, it did them no service. There is in hell such mourning as this; but tears will not quench the flames, nor cool the tongue.