The Licit and the Illicit

By Allah, I do not fear poverty and starvation overtaking you, but I fear that you will have abundant wealth at your disposal like the communities before you who too had enormous wealth. You will then become excessively greedy in accumulating wealth (without any concern for licit and illicit means) just as the religious communities before you had done. This (greed) will be the cause of your ruin and devastation just as it destroyed people before you.

Bukhari & Muslim