The OIC Fiqh Academy's ruling on 'urf (custom) - when does a prevailing custom actually bind in Islamic law, and when is it worthless?

WHEN DOES 'EVERYONE DOES IT THIS WAY' ACTUALLY COUNT IN ISLAMIC LAW? A riba-free household runs into custom ('urf) constantly: what a bank statement means, what 'delivery' or a 'defect' means in a trade, what an unwritten commercial norm obliges. Resolution No. 47 (9/5), adopted at the OIC Fiqh Academy's 5th session in Kuwait City (1-6 Jumada al-Ula 1409H / 10-15 December 1988), is the Academy's settled, four-point ruling on exactly this: when a prevailing custom is legally binding, and - crucially - when it is not. It is a decisive operative ruling, not a deferral. Its most important line for a riba-free household is the first condition it places on any custom: a custom that clashes with the Shariah is 'corrupt custom' and carries no weight - so 'everyone borrows on interest' can never make interest lawful.

WHY THE ACADEMY RULED. The Council issued the resolution 'Having examined the research papers of the Academy's members and experts concerning 'Urf (Custom),' and 'Having listened to the discussions on the subject' (IRTI: 'Having reviewed the papers presented by the Members and experts on "Customs" and Having listened to the discussions held on the subject'). So this is a considered ruling on the authority of custom in Shariah, decided at the same 5th session (Kuwait, 1988) that also produced Resolution 42 on the changing value of currency, Resolution 44 on rent-to-own, and Resolution 46 on the limits of a trader's profit.

FIRST - WHAT 'URF (CUSTOM) MEANS. Verbatim (official): 'The term 'Urf refers to any saying, habit, or a disregard people do and are used to it, which may or may not be recognized by Shariah.' (IRTI: 'The word "Custom" means any saying, habits, abandonment or things people do and get used to. It may or may be acceptable to Shari'a.' - the IRTI edition drops the 'not', a garble reproduced not corrected.) The definition is deliberately wide: custom is any settled practice - something people habitually SAY, habitually DO, or habitually LEAVE UNDONE ('a disregard' / 'abandonment') - and the very definition flags that a custom 'may or may NOT be recognized by Shariah'. In other words, the ruling opens by warning that being customary is not the same as being lawful.

SECOND - SPECIFIC CUSTOM VERSUS GENERAL CUSTOM. Verbatim (official): 'If 'Urf is a specific custom, it is recognized by those who subscribe to it. On the other hand, if it is a general custom, it is recognized by all.' (IRTI: 'If it is a specific custom, it is recognized by those who subscribe to it. On the other hand, if it is a general custom, it is recognized by all.' - here the two editions agree almost word for word.) The Academy distinguishes a SPECIFIC custom (the practice of a particular trade, market, profession or locality - binding on the people of that trade or place) from a GENERAL custom (a practice common to everyone - binding on all). This is why a norm inside a specialised market can bind the traders in it even if outsiders have never heard of it.

THIRD - THE FOUR CONDITIONS FOR A CUSTOM TO BE LEGALLY BINDING. This is the operative core. Verbatim (official): 'To be recognized by Shariah, an 'Urf should meet the following conditions:' (IRTI: 'To be recognized by Shari'a, a custom should meet the following conditions'). The four conditions:

(a) IT MUST NOT CONTRADICT THE SHARIAH. Verbatim (official): 'It should be in conformity with Shariah. If it contradicts a text or a rule of Shariah, then it is corrupt custom.' (IRTI: 'It should be in conformity with Shari'a. If it contradicts a rule of Shari'a, then it is not acceptable.' - the official edition adds 'a text or', and names the result 'corrupt custom' [in the fiqh tradition, 'urf fasid], where the IRTI edition says only 'not acceptable'.) This is the gem: a custom that collides with a Shariah text or rule is not a mitigating factor, an excuse or a partial defence - it is simply void as a source of obligation. The universality of a bad practice does not launder it.

(b) IT MUST BE PERMANENT OR PREDOMINANT. Verbatim (official): 'It should be permanent or predominant.' (IRTI: 'It should be permanent of frequent.' - the IRTI 'of' is a typo for 'or', reproduced not corrected, and it renders the second word 'frequent' where the official reads 'predominant'.) A one-off or minority practice is not a custom; the practice must be the settled or prevailing way of doing things.

(c) IT MUST ALREADY EXIST WHEN THE MATTER ARISES. Verbatim (both editions, identically): 'It should already exist at the time of the issue involved.' A custom that only emerges after a contract is struck cannot be read back into it; the binding custom is the one prevailing when the transaction is made.

(d) THE PARTIES MUST NOT HAVE CONTRACTED OUT OF IT. Verbatim (official): 'The contracting parties should not pronounce against it, in which case it is not enforceable.' (IRTI: 'The contracting parties should not agree on opposite provisions, in which case it is not enforceable.') Custom fills the GAPS the parties left silent; it does not override what they expressly agreed. If the contract says otherwise, the express term wins and the custom drops away. This is the doctrine that lets 'the known by custom is like the stipulated by contract' operate safely: custom is a default, not a straitjacket.

FOURTH - A JUDGE OR MUFTI MUST TRACK CHANGING CUSTOMS. Verbatim (official): 'A Faqih - whether a mufti or a judge - should not confine himself to the dictums contained in Fiqh books without giving due regard to the changing customs.' (IRTI: 'A Fiqh scholar (whether Mufti or Judge) should not confine himself to dictum contained in Fiqh books without giving due regard to changing customs.') This is the forward-looking counterpart to the first point. Because many classical rulings were themselves built on the customs of their day, a jurist may not mechanically transplant an old ruling whose customary basis has since changed; he must give 'due regard' to the customs actually prevailing now. This is the usul principle - 'rulings change with the change of the times' as an expression of changing 'urf - that authorises the Academy's own contemporary contract rulings to read modern commercial practice into old contract forms.

THE PRINCIPLE UNDERNEATH ALL FOUR. Read together, the four points draw one careful line: custom is a genuine, operative source in the fiqh of transactions - it defines the unstated terms of a deal, binds a trade or a whole community, and even obliges a jurist to keep his rulings current (points 2, 3d, 4) - BUT only within the Shariah, never against it (point 1a), only when it is settled and pre-existing (points 3b, 3c), and only where the parties have not spoken for themselves (point 3d). Custom is a servant of the law and a filler of silences; it is never a trump over a text.

HOW A RIBA-FREE HOUSEHOLD ACTUALLY USES THIS. (a) The headline defence 'but everyone finances a house/car this way' is answered directly by point 1a: a custom that contradicts a Shariah text - and interest (riba) does - is 'corrupt custom' with no legal weight, no matter how universal it is; ubiquity is not a rukhsah. (b) Where the Shariah is silent, custom legitimately fills the gap - trade norms about what counts as delivery, an acceptable defect, a standard quality, or a customary payment term are real and binding on the parties (points 1-3), which is why the corpus's contract rulings so often defer to prevailing commercial practice. (c) A norm inside a specialised market binds the people of that market even if it is unknown outside it (point 2), so 'the custom of this trade' can be a valid term of a deal. (d) You can always contract OUT of a custom by an express clause: if your agreement says something different, your written term governs and the custom falls away (point 3d) - so write down anything you do not want decided by 'the usual practice'. (e) The custom that counts is the one prevailing WHEN you transact (point 3c), not one that appears later. (f) And because customs change, a fatwa given decades ago on a practice whose customary basis has since shifted may need revisiting (point 4) - a reason to seek a current ruling on a modern product rather than assume an old one still fits.

WHERE THIS SITS IN THE CORPUS. Resolution 47 is the corpus's usul (legal-theory) anchor for CUSTOM - the principle the Academy's many transaction rulings quietly rely on whenever they defer to trade practice. Its first condition (a custom against a text is void) is the methodological backbone of every riba ruling in the corpus, from Resolution 10 (9/2) (usury-based bank transactions) to Resolution 21 (9/3) (paper money is ribawi money): the wrongness of interest is not softened by how normal it has become. Its fourth point (track changing customs) is the licence behind the Academy's willingness to apply old contract forms to modern commerce - istisna' in Resolution 65 (3/7), qabd in Resolution 53 (4/6), the down-payment sale in Resolution 72 (3/8), auction practice in Resolution 73 (4/8) - all of which read prevailing commercial custom into the classical contract. Resolution 47 was decided at the same 5th session as Resolution 42 (4/5) (changing value of currency), Resolution 44 (6/5) (rent-to-own) and Resolution 46 (8/5) (limitation of traders' profits). The cross-links here are this corpus's own mapping of where a custom ruling sits, offered as navigation, not as claims made by Resolution 47 itself.

GENUINE DIFFERENCES BETWEEN THE TWO EDITIONS (disclosed, not smoothed). The two translations agree on all four operative points while differing in wording - a CLEAN pairing (points 1-4 carried identically, no substantive discrepancy), reported honestly. TITLE: official body heading ''Urf (Custom)' versus IRTI 'Concerning Customs'. ACADEMY NAME: official 'the International Islamic Fiqh Academy of the Organization of the Islamic Conference' versus IRTI 'the Islamic Fiqh Academy' (the IRTI edition also prints 'Figh' for 'Fiqh' elsewhere in its heading, a misprint reproduced not corrected). POINT 1 - the definition: official 'any saying, habit, or a disregard people do and are used to it, which may or may not be recognized by Shariah' versus IRTI 'any saying, habits, abandonment or things people do and get used to. It may or may be acceptable to Shari'a' (the IRTI edition drops the crucial 'not' from 'may or may [not] be', a garble reproduced not corrected; 'disregard' versus 'abandonment'; 'recognized by Shariah' versus 'acceptable to Shari'a'). POINT 3a - the non-contradiction condition: official 'If it contradicts a text or a rule of Shariah, then it is corrupt custom' versus IRTI 'If it contradicts a rule of Shari'a, then it is not acceptable' (official adds 'a text or'; 'corrupt custom' versus 'not acceptable'). POINT 3b: official 'permanent or predominant' versus IRTI 'permanent of frequent' (IRTI 'of' a typo for 'or'; 'predominant' versus 'frequent'). POINT 3d: official 'should not pronounce against it' versus IRTI 'should not agree on opposite provisions'. POINT 4: official 'A Faqih - whether a mufti or a judge - ... the dictums contained in Fiqh books ... the changing customs' versus IRTI 'A Fiqh scholar (whether Mufti or Judge) ... dictum contained in Fiqh books ... changing customs'. CLOSING: official 'Indeed, Allah is All-Knowing.' versus IRTI 'Verily, Allah is All-Knowing'. SPELLING throughout: official 'Shariah' versus IRTI 'Shari'a'. Every verbatim quote used above was machine-checked against both source PDFs (line-wrap, hyphenation, inserted-page-number and diacritic aware, whitespace-normalised, 29/29 OK).

AN HONEST NOTE ON WHAT IS AND IS NOT HERE. This is a settled operative ruling - four decisive points defining custom and fixing the conditions under which it is legally binding - not a deferral. The quoted parts are the resolution's own words; the framing question ('when does "everyone does it" count?'), the modern examples (interest being normal, trade norms, market practice, contracting out), and the household how-to are plain restatements and honest applications of the resolution's own four points, not new rulings added by this site. The resolution cites no Qur'an verse and no hadith number, records no madhab tally and no vote count, and names no bank, product, figure or rate, so none is reported here. The fiqh label ''urf fasid' (corrupt custom) and the maxims alluded to ('the known by custom is like the stipulated by contract'; 'rulings change with the change of times') are the standard scholarly vocabulary for the doctrine the resolution states in its own words, offered as orientation, not as extra quotations from Resolution 47. The cross-links to Resolutions 10, 21, 42, 44, 46, 53, 65, 72 and 73 are this corpus's own mapping of where a custom ruling sits, offered as navigation, not as claims made by Resolution 47 itself.