The Prohibition of Riba in Quran and Sunnah

Riba — translated variously as usury or interest — is one of the most explicitly and emphatically prohibited practices in Islamic law. Muhammad Taqi Usmani opens his introduction to Islamic finance by establishing the Quranic and prophetic basis for this prohibition, situating it within the broader Islamic economic philosophy, and explaining why this prohibition is not an archaic survival but a living principle with profound contemporary relevance.

The Quranic prohibition of riba unfolds across four distinct stages of revelation, reflecting a gradual process of establishing the ruling in the early Muslim community. The first stage (Ar-Rum 30:39) noted that riba does not increase one's wealth before Allah, in contrast to zakah. The second (An-Nisa 4:161) condemned riba as a practice of the Jews who had been forbidden from it. The third (Aal Imran 3:130) prohibited 'doubled and multiplied' riba. The final and most comprehensive stage (Al-Baqarah 2:275-281) declared all forms of riba prohibited in the most emphatic terms available in Arabic rhetoric, warning those who persist in it of war from Allah and His Messenger — a warning unique in the Quran to this prohibition and to polytheism.

Usmani examines the pivotal verse Al-Baqarah 2:275, which states: 'Those who consume interest cannot stand except as one stands who is being beaten by Satan into insanity. That is because they say, "Trade is like interest." But Allah has permitted trade and has forbidden interest.' This verse directly addresses the most common rationalization for riba — that it is functionally equivalent to the profit from trade — and rejects it as a confusion of fundamentally different things. Usmani explains the philosophical distinction: trade involves genuine risk-sharing, the possibility of loss as well as gain, and the creation of real value through exchange. Interest-based lending involves a guaranteed return regardless of the outcome of the borrower's enterprise, concentrating risk on the borrower while the lender profits with certainty.

The prophetic tradition reinforces the Quranic prohibition with remarkable specificity. The famous hadith narrated by Jabir ibn Abdullah states that the Prophet, peace be upon him, 'cursed the one who consumes riba, the one who pays it, the one who writes the contract, and the two witnesses to it — saying they are all equal in sin.' This hadith, recorded in Sahih Muslim, demonstrates that the prohibition extends beyond the direct parties to the transaction to encompass all who facilitate or enable it — a principle with significant implications for those who work in conventional financial institutions.

Usmani addresses the scholarly discussion of what precisely constitutes riba. The scholars have identified two primary categories: riba al-nasi'ah (riba of delay — the increase that accrues over time on a loan) and riba al-fadl (riba of surplus — the exchange of same commodities in unequal quantities, as prohibited in specific contexts by the prophetic hadith on the six commodities: gold, silver, wheat, barley, dates, and salt). Both forms are prohibited, though the first is the more commonly encountered form in modern financial contexts.

The author also presents the Islamic economic rationale for the prohibition. An interest-based economy creates a class of people who receive guaranteed returns on wealth without contributing labor, risk, or entrepreneurial effort. Over time, this concentrates wealth in the hands of capital-owners at the expense of those who must borrow — producing the structural inequalities that Islamic economics, through its prohibition of riba and requirement of zakah, is designed to prevent.