Adam Clarke on James 5:2

Your riches are corrupted - Σεσηπε· Are putrefied. The term πλουτος, riches, is to be taken here, not for gold, silver, or precious stones, (for these could not putrefy), but for the produce of the fields and flocks, the different stores of grain, wine, and oil, which they had laid up in their granaries, and the various changes of raiment which they had amassed in their wardrobes.