Fiqh al-Sarf — Rawzat

Fiqh al-Sarf — Currency Exchange in Islamic Law: The Ribawi Commodities Rule, the Hand-to-Hand Requirement for Like-Kind Exchange, and Why Islamic Banks Cannot Participate in Conventional Forex Markets

فِقهُ الصَّرف — الصَّرفُ فِي الفِقهِ الإِسلَامِيّ: قَاعِدَةُ الرِّبَوِيَّاتِ وَاشتِرَاطُ التَّقَابُضِ فِي الصَّرفِ مِثلًا بِمِثلٍ وَلِمَاذَا لَا يُمكِنُ لِلبُنُوكِ الإِسلَامِيَّةِ المُشَارَكَةُ فِي أَسوَاقِ الصَّرفِ التَّقلِيدِيَّة

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Fiqh al-Sarf (فِقهُ الصَّرف — Jurisprudence of Currency Exchange; *sarf* = to change, to exchange currency; the Islamic law of currency exchange is one of the strictest commercial rules, deriving from the hadith on the six ribawi [riba-susceptible] commodities [gold, silver, wheat, barley, dates, salt — Bukhari/Muslim]; the core rule: exchanging like for like [gold for gold] must be: [1] same quantity [mithl bi-mithl]; [2] no delay — hand-to-hand [yadan bi-yad]; [3] no excess [sawa'an bi-sawa']; whereas exchanging different commodities from the ribawi list [gold for silver = currency exchange] must be: [1] hand-to-hand [yadan bi-yad], but [2] different quantities are permitted; modern application: currencies are treated as analogous to gold and silver — their exchange must be spot [immediate settlement], not deferred; forward forex contracts, currency futures, and most derivatives are prohibited because they involve deferred delivery; AAOIFI Standard 1 [Trading in Currencies] governs; Islamic banks use commodity murabaha [tawarruq] as a workaround for some forex needs; Islamic finance's participation in global financial markets is significantly constrained by sarf rules) is one of the most technically demanding areas of contemporary Islamic finance.

The Ribawi Commodities Rule

The Prophet specified six commodities subject to strict exchange rules: gold, silver, wheat, barley, dates, and salt. For these commodities:

Same for same: Gold for gold must be equal weight, delivered simultaneously, with no excess on either side. Any excess is riba al-fadl (excess riba).

Different for different: Gold for silver (or wheat for barley — different categories from the list) must still be delivered simultaneously (yadan bi-yad), but different quantities are permitted since they are genuinely different commodities.

Modern Currencies as Gold and Silver

Classical scholars debated whether paper currencies fall under the ribawi rules. The contemporary majority position (AAOIFI, OIC Fiqh Academy) treats currencies as analogous to gold and silver:

Currency exchange must be spot (same day settlement)
Forward forex contracts are prohibited
Currency futures and options are prohibited
Currency swaps with deferred settlement are prohibited

The Islamic Bank’s Forex Problem

Conventional banks manage currency risk through forward contracts and swaps. Islamic banks, prohibited from these instruments, face a genuine problem: how to hedge currency exposure in international murabaha or sukuk transactions.

Current workarounds:

Commodity murabaha (tawarruq al-sarf): a sequence of commodity purchases and sales that achieve a net currency transfer
Wa’ad (unilateral promises): binding commitments to exchange at a future rate, structured as successive spot transactions

Fiqh al-Sarf — Currency Exchange in Islamic Law: The Ribawi Commodities Rule, the Hand-to-Hand Requirement for Like-Kind Exchange, and Why Islamic Banks Cannot Participate in Conventional Forex Markets

The Ribawi Commodities Rule

Modern Currencies as Gold and Silver

The Islamic Bank’s Forex Problem

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