Al-Qurtubi on Commerce and Riba Verses

The Quran's prohibition of riba — broadly translated as usury or interest — is one of the most consequential pieces of Islamic legislation and one of the most demanding to apply. The primary riba verses appear in Surah al-Baqarah 275-280, and al-Qurtubi's commentary on them is among the most detailed in classical tafsir literature, drawing on the extensive hadith tradition concerning riba and the full range of juristic opinion across the four madhabs.

He begins with Surah al-Baqarah 275: 'Those who consume riba cannot stand on the Day of Resurrection except as one stands who is being beaten by Satan into insanity.' Al-Qurtubi notes that the verse first describes the psychological and spiritual condition of those addicted to riba — their inability to distinguish legitimate profit from forbidden gain — before pronouncing its judgment. He then addresses the fundamental question of definition: what exactly is riba?

The classical scholars identified two main categories. The first is riba an-nasi'ah: an addition charged for deferring repayment of a loan, which is the pre-Islamic Arab practice the Quran was most directly prohibiting. The second, derived primarily from hadith rather than directly from the verses, is riba al-fadl: an imbalance in direct exchange between goods of the same category (such as gold for gold, silver for silver, wheat for wheat), where one party receives more than the other. The hadith of the six commodities — gold, silver, wheat, barley, dates, salt — defines the goods to which this rule applies in their canonical form.

Al-Qurtubi discusses the conditions that make riba al-fadl applicable: same genus, hand-to-hand exchange, and equal quantity. He presents the Maliki, Shafi'i, Hanafi, and Hanbali positions on what the operative cause (illa) of riba prohibition is — weight and genus (Hanbali/Shafi'i majority), foodstuff nature (Maliki), or value exchange (some Hanafi views) — and how each operative cause affects the extension of riba rulings to commodities not mentioned in the original hadith. This is a technical discussion of considerable complexity, and al-Qurtubi handles it with the precision of a trained jurist.

For Surah al-Baqarah 278-279 — 'O you who believe, fear Allah and give up what remains of riba, if you should be believers. And if you do not, take notice of a war against you from Allah and His Messenger' — al-Qurtubi pauses at the severity of the warning. He notes that this declaration of war from Allah is uniquely severe in Quranic language; no other sin receives such a formulation. He cites the scholarly explanation that this severity reflects the depth of the harm riba does to social solidarity and economic justice, as it allows wealth to accumulate without productive labor and exploits the desperation of those in need.

He concludes his treatment of the riba section with Surah al-Baqarah 280: 'And if the debtor is in difficulty, grant him respite until he has ease. But to remit it as charity is better for you, if you knew.' He explains that this verse establishes both an obligation (granting respite to a genuinely unable debtor) and a recommended virtue (remitting the debt entirely as sadaqa). He notes that the obligation of granting respite applies to all debts, not only riba-based ones, making it a general principle of merciful creditor conduct in Islamic law.