Adam Clarke on Numbers 13:27

We came unto the land, etc. - It is astonishing that men so dastardly as these should have had courage enough to risk their persons in searching the land. But probably though destitute of valor they had a sufficiency of cunning, and this carried them through. The report they brought was exceedingly discouraging, and naturally tended to produce the effect mentioned in the next chapter. The conduct of Joshua and Caleb was alone magnanimous, and worthy of the cause in which they were embarked.