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wa-ʾakhdhihimu r-ribā wa-qad nuhū ʿanhu wa-ʾaklihim ʾamwāla n-nāsi bi-l-bāṭili wa-ʾaʿtadnā li-l-kāfirīna minhum ʿadhāban ʾalīman
and for their taking usury—though they had been forbidden from it—and for eating up the wealth of the people wrongfully. And We have prepared for the faithless among them a painful punishment.
— Ali Quli Qarai
Surah An-Nisa', Verse 161
161. "And (for) their taking usury when indeed they were forbidden from it, and (for) their devouring the property of people unrightfully, and We prepared for the disbelievers from among them a painful chastisement."
The prohibition of usury is also mentioned in the present Torah (Deuteronomy, Chapter 23, and No. 19 & 20):
19. Thou shalt not lend upon usury to thy brother; usury of money, usury of victuals, usury of anything that is lent upon usury:
20. Unto a stranger thou mayest lend upon usury; but unto thy brother thou shalt not lend upon usury: that the Lord thy God may bless thee in all that thou set test thine hand to in the land whither thou goest to possess it.
Usury seems to be the source of profit and the factor of happiness, but it is the cause of deprivations and punishments. All heavenly religions are sensitive, and have words, due to the material and financial connections between human-beings and also due to their gains and expenditures. As long as injustice, usury, and living on unlawful money have not set a person in the course of infidelity, it is easy for him to return to the right path, otherwise the sins may become the cause of infidelity, and infidels are involved in punishment.