LessonsBab al-Sarf: Circulating Fulus, Obsolete Coins and Money-Changer ExchangesQuiz

After gold, silver and adulterated coins, Quduri turns to fulus: small, historically often copper, coins accepted as payment by custom rather than by an intrinsic gold or silver standard.
Two questions must be separated: are the coins still accepted in trade, and does the contract identify particular coins or merely a payable amount? The answers govern the legal distinctions in this passage.

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Bab al-Sarf: Circulating Fulus, Obsolete Coins and Money-Changer Exchanges

Monetary status, obsolescence, customary half-dirham valuation and contrasting composite exchange formulas Read the bilingual lesson for Bab al-Sarf: Circulating Fulus, Obsolete Coins and Money-Changer Exchanges and test your understanding with a focused quiz.

Lesson

1. Why circulation matters for fulus

After gold, silver and adulterated coins, Quduri turns to fulus: small, historically often copper, coins accepted as payment by custom rather than by an intrinsic gold or silver standard.
Two questions must be separated: are the coins still accepted in trade, and does the contract identify particular coins or merely a payable amount? The answers govern the legal distinctions in this passage.

2. A sale for circulating fulus

ويجوز البيع بالفلوس النافقة
Translation: A sale for circulating fulus is valid.
Here nafiqah means coins current in the market; it does not carry the ethical meaning of hypocrisy. If a recognised class of copper coins is routinely accepted in a town, a known amount of such coins can serve as the sale price.
This concerns the historical customary currency, not every legal issue governing present-day paper or digital money.

3. Why particular circulating coins need not be identified

وإن لم تتعين
Translation: Even without identifying particular individual coins.
Circulating fulus function as currency. A buyer owes the agreed quantity of accepted coins, not necessarily those particular physical pieces held when the contract was made. If selected pieces are lost, equivalent circulating coins can normally discharge the price.
This distinguishes identifying the actual specimens from knowing the amount owed, which must still be determined.

4. Why obsolete fulus require identification

وإن كانت كاسدة لم يجز البيع بها حتى يعينها
Translation: If the fulus are obsolete, a sale using them is invalid until the coins are specified.
Kasid coins no longer function as accepted money; they are treated as identifiable items of property. Merely promising unspecified obsolete pieces does not adequately identify the consideration.
Once particular items are identified and the other sale conditions hold, they may be exchanged as property rather than assumed to be circulating currency.

5. The same metal, two legal roles

Case 1: A price of 20 circulating copper coins may be owed without identifying the precise physical pieces, provided the amount and monetary convention are known.
Case 2: The agreement concerns 20 obsolete coins as articles of property; their individual identity matters because they no longer constitute ordinary circulating payment.
The decisive contrast is the coin's customary monetary role, not just its colour or metallic weight. Other contractual conditions still apply.

6. Fulus cease circulating before payment

وإذا باع بالفلوس النافقة ثم كسدت بطل البيع عند أبي حنيفة
Translation: If something was sold for circulating fulus and the coins subsequently ceased circulating, the sale fails according to Abu Hanifah.
The issue concerns an unpaid stipulated price. It was accepted money when contracted, but before payment entirely lost that role; in this reported view, the original contract does not remain intact.
This passage does not automatically undo an already completed sale or cover every ordinary fall in purchasing power.

7. The disciples and substituted value

Fath al-Qadir relates the disciples' treatment of obsolete fulus to the disagreement just studied over obsolete mixed coins. Abu Yusuf assesses the value on the contract date, while Muhammad uses the last date of circulation.
If the historical coins were worth 500 at contracting and 450 when circulation ended, the two assessments differ in valuation date. The figures only illustrate the classical distinction, not a blanket rule for modern inflation.

8. Obsolescence versus loss of value

The operative distinction is:
1. Depreciation: a coin still circulates, but its purchasing power or exchange value falls.
2. Obsolescence: traders cease accepting it as payment.
Its monetary status survives the first change but disappears in the second. A fall in value alone does not establish Quduri's specific case of complete loss of circulation.

9. Pricing goods in half a dirham’s worth of fulus

ومن اشترى شيئا بنصف درهم فلوسا جاز البيع
Translation: Someone who buys an item for half a dirham's worth of fulus has made a valid sale.
The wording does not mean a half-dirham weight of copper. It denotes the quantity of fulus sold for half a silver dirham in that market.
If 1 dirham buys 20 accepted fulus, the price represents 10 such coins. The illustration assumes a known, stable local convention at the time of contracting.

10. What quantity of fulus is owed?

وعليه ما يباع بنصف درهم من الفلوس
Translation: He owes the quantity of fulus ordinarily sold for half a dirham.
A sale price must be knowable, but a well-established customary quantity can provide that knowledge without stating the coin count. If half a dirham regularly purchases 12 fulus, 12 are due, not ten or twenty.
Where no determinate local convention exists, this particular reasoning cannot by itself remove uncertainty about the agreed price.

11. Zufar’s objection to an unstated coin count

Fath al-Qadir records Zufar's objection: fulus are counted, so saying 'half a dirham's worth of fulus' without stating the number risks an unknown price.
The answer is that an established custom, under which the number purchased for half a dirham is commonly known, removes uncertainty about the consideration. The question is reliable determinability, not merely a rigid verbal formula.

12. The scope of customary valuation

The commentary also discusses fulus valued at smaller silver fractions such as a daniq or qirat. Abu Yusuf extends the principle to a full dirham's worth; a more restricted report from Muhammad is also discussed.
This is additional commentary analysis, not another line of Quduri's present text. The essential principle is that the coin quantity corresponding to the named amount is genuinely recognised in local custom.

13. The money changer’s composite transaction

ومن أعطى الصيرفي درهما
Translation: Someone handed a dirham to a money changer.
A sarraf exchanged money and coins. The following case exchanges one dirham for two kinds of consideration: copper fulus and a piece of silver. Because silver is exchanged for silver as one component, the equal-weight rule must be respected.
Changes in wording affect the legal allocation of the payment, so the two examples cannot be conflated.

14. First formulation: expressly allocating half the dirham

أعطني بنصفه فلوسا وبنصفه نصفا إلا حبة
Translation: Give me fulus for one half of it, and for the other half a half-dirham silver piece minus one grain.
The repetition of bi-nisfihi ('for half of it') is decisive. Half of the original dirham is expressly assigned to the fulus, and the other half to a silver piece weighing one grain less than half a dirham.
A grain (habbah) is a small historical weight unit; no fixed modern gram equivalent is asserted here.

15. Why the first formulation contains unequal silver

Model the original dirham as 100 imaginary weight units. The first request allocates:
First 50 units of silver → copper fulus
Remaining 50 units of silver → 49 units of silver
The second correspondence exchanges 50 units of silver for 49 of the same metal, which creates the unlawful excess. The units are purely illustrative, not a claim about historic dirham or grain weights.

16. Abu Hanifah: the composite contract fails as a whole

فسد البيع في الجميع عند أبي حنيفة
Translation: According to Abu Hanifah, the entire sale is defective.
The agreement combines a permissible copper-coin component with an unequal silver-for-silver component. Because both were tied into one composite transaction, the invalidity affects the whole contract in Abu Hanifah's approach.
The copper-coin exchange is not intrinsically prohibited; the problem is its packaging with the unlawful silver correspondence in one contract.

17. The disciples: separating the valid portion

جاز البيع في الفلوس وبطل فيما بقي
Translation: The sale of fulus is valid; the remainder of the exchange is void.
Abu Yusuf and Muhammad treat the components and their assigned considerations as distinguishable and separable. Thus, the half-dirham-for-fulus component can stand while the unequal silver component fails.
The disagreement is not about whether unequal silver is valid—it is not—but whether the sound part of the combined deal can be preserved.

18. The reasoning behind indivisibility

This disagreement turns on the divisibility of a transaction. If one component of a unified agreement is invalid from the outset, can the valid component survive independently?
Abu Hanifah's ruling extends the defect through this particular composite sale. The disciples can preserve the fulus exchange because each part's consideration was expressly assigned.
These are rulings for the stated historical configuration, not an automatic formula governing every modern bundled transaction.

19. Separate requests versus one combined request

Fath al-Qadir also discusses making the two requests as genuinely separate exchanges. On a supported explanation, an independently valid fulus transaction need not fail simply because another separate silver exchange is impermissible.
Merely repeating words does not always create two valid contracts: the actual offer, acceptance, and whether one or two exchanges occurred matter. This is a commentary refinement, not an unrestricted rule read into Quduri's first formulation.

20. Second formulation: a small wording change

ولو قال أعطني نصف درهم فلوسا ونصفا إلا حبة جاز البيع
Translation: If he instead says, 'Give me half a dirham's worth of fulus and silver weighing a half-dirham minus one grain,' the exchange is valid.
The speaker has not preassigned half of the original dirham to each component. Rather, he requests a known amount of fulus and a slightly smaller silver piece together.
This wording allows an allocation that preserves equality within the silver-to-silver part.

21. How the second formulation preserves silver equality

Again model the original dirham as 100 imaginary silver units. The changer supplies 49 units of silver plus fulus conventionally sold for half a dirham. A legally permissible allocation is:
49 silver units from the original → 49 silver units received
Remaining 51 silver units from the original → copper fulus
The same-metal component is now 49 for 49. The remaining 51 units are exchanged for a different kind of property, where that same-metal weight-equality rule does not apply.

22. Side-by-side analysis of the two formulas

Formula 1: 'For half of it give fulus; for the other half give silver equal to half minus one grain.'
Result: 50 silver units assigned against 49; Abu Hanifah invalidates the entire composite exchange while the disciples uphold the fulus portion.
Formula 2: 'Give fulus worth half a dirham and silver equal to half minus a grain.'
Result: 49 silver units may be matched against 49; the remaining original silver is matched to fulus, so Quduri validates it.
The pivotal point is how the consideration is allocated by the wording.

23. A careful sequence for evaluating an exchange

For any composite money-changing arrangement, assess it in order:
1. What is each party exchanging?
2. Which genus is expressly assigned against which consideration?
3. Are the same-silver weights equal?
4. If one component fails, may the remainder survive under the relevant juristic view?
5. Are the applicable session-possession conditions fulfilled?
The permissible formulation in this lesson is not exempt from the independent possession rules of sarf.

24. Applied exercise: two quotations of the same deal

Suppose 20 fulus circulate per dirham, and a changer offers ten fulus plus silver weighing half a dirham minus one grain.
If the buyer assigns one half of his dirham to the ten fulus and the other half to the smaller silver piece, the unequal same-silver problem appears.
If the buyer requests the customary half-dirham's worth of fulus and the silver piece without preallocating the two halves, Quduri's second construction can be valid. Mutual possession remains a separate requirement.

25. Concluding Bab al-Sarf

The final passage completes three interrelated principles:
1. Customary monetary function: circulating and obsolete fulus have different legal treatment.
2. Determinacy by custom: the number of fulus worth half a dirham may be known by established market practice.
3. Allocation of countervalues: expressly assigning halves in a money-changer's deal can change the result compared with requesting an unallocated bundle.
This completes Bab al-Sarf. The next section in Quduri is Kitab al-Rahn, dealing with pledges and security for debts.

Practice questions

Question 1

What are fulus in this passage?

  • Only trade-account entries
  • Agricultural parcels
  • Small metallic coins circulating by custom
  • Gold coins necessarily of equal weight

Question 2

What does nafiqah describe for fulus?

  • Being current and accepted in trade
  • Being pure silver
  • Necessarily rising in value
  • Every currency being prohibited

Question 3

Why can circulating fulus serve as price without specifying each piece?

  • Because all weights are identical
  • Because the sale need not state a price
  • Because custom treats a known amount as money
  • Because fulus cannot be possessed

Question 4

What is additionally required for obsolete fulus?

  • Identifying the particular coins
  • Melting every coin
  • Requiring a deferred price
  • Paying only with gold

Question 5

Which requirement remains even for circulating fulus?

  • The coins must be silver
  • All coins carry an identical mark
  • The amount owed must be determinable
  • The sold item remain unidentified

Question 6

Why does a coin cease to be treated as circulating currency?

  • Because it is round
  • Because a buyer dislikes it
  • Because it stops being accepted in market payments
  • Necessarily when its image changes

Question 7

What is Abu Hanifah’s reported ruling if stipulated unpaid fulus cease circulating?

  • Price automatically doubles
  • Buyer must always convey land
  • Seller owes more zakat
  • The original sale fails

Question 8

What valuation date is associated with Abu Yusuf for obsolete fulus?

  • An arbitrary date
  • Only the current retail price of the goods
  • Value on the day of contracting
  • One year after obsolescence

Question 9

What is the date relevant to Muhammad’s valuation?

  • When the coin was first minted
  • A later buyer’s date
  • The last day the coins circulated
  • When the goods were manufactured

Question 10

Which case is depreciation rather than obsolescence?

  • The coin remains accepted but its value falls
  • It is withdrawn and ceases circulating
  • All traders abandon it as money
  • It is sold as specified pieces of property

Question 11

What does “half a dirham in fulus” mean?

  • Gold worth half a dirham
  • Silver coins worth half a dirham
  • Copper physically weighing half a dirham
  • The fulus obtainable for half a dirham

Question 12

If 1 dirham normally purchases 24 fulus, what is a half-dirham’s worth?

  • 12
  • 8
  • 18
  • 24

Question 13

What difficulty arises if no determinate exchange custom exists?

  • Fulus become gold
  • The consideration may be uncertain
  • Possession never matters
  • Every sale becomes salam

Question 14

What was Zufar’s basic objection to the half-dirham-fulus expression?

  • Changers cannot own goods
  • Fulus cannot be property
  • It is always a silver price
  • The number of countable coins must be stated

Question 15

Who allows the customary fulus equivalent of a whole dirham more broadly in the commentary?

  • No one
  • Only Zufar
  • Only Malik
  • Abu Yusuf

Question 16

Which two forms of consideration are requested from the money changer?

  • Two properties
  • Fulus and silver slightly less than a half-dirham
  • Only two kinds of fulus
  • Grain and land

Question 17

What is the effect of repeating “bi-nisfihi” in the first formula?

  • Two sellers become necessary
  • The silver’s weight automatically changes
  • Each half of the original dirham is expressly allocated
  • Possession no longer matters

Question 18

Why is 50 imaginary silver units for 49 silver units impermissible?

  • Because every bundle is prohibited
  • Because same-silver equality by weight is violated
  • Because 49 is odd
  • Because fulus are made of gold

Question 19

What is Abu Hanifah’s ruling on the first composite exchange?

  • Every aspect is valid
  • The whole unified bargain is defective
  • Only the silver part is valid
  • Double the fulus

Question 20

How do the two disciples rule on the first formula?

  • The fulus part is valid; the remaining part is void
  • Only the unequal silver portion is valid
  • Both components are valid
  • The seller must waive interest

Question 21

What chiefly explains the disagreement in the first composite sale?

  • The colour of a half-dirham
  • Copper mining
  • Rainfall
  • Separating valid and invalid parts of one deal

Question 22

What wording change is decisive in the second formulation?

  • Not preassigning each half of the original dirham to a specific component
  • Calling the coin a dinar
  • Making the grain a new coin
  • Omitting the changer’s name

Question 23

Which allocation validates the second formula with 100 original silver units and 49 silver units received?

  • 100 for 49 silver, fulus unmatched
  • 50 original silver for 49 silver
  • 49 for 49 silver; remaining 51 against fulus
  • Exclude the silver from possession rules

Question 24

How does Quduri rule on the second money-changing formulation?

  • It requires an extra half-weight
  • Valid only after one day
  • The exchange is valid, subject to applicable possession rules
  • Only the fulus part is always void

Question 25

What does “half a dirham in fulus” identify in the second formula?

  • The customary amount of fulus, not an express allocation of half the original dirham
  • The silver must exceed a half
  • The possession time is deferred
  • Fulus turn into pure silver

Question 26

Why can two requests for similar items yield different legal outcomes?

  • Because every fulus contains gold
  • Changing silver’s shape legalises usury
  • The expressly stipulated allocation of countervalues differs
  • Because a grain has no legal status

Question 27

If the identified circulating coins are lost, what generally happens to the monetary obligation?

  • Payment must be in gold
  • The contract automatically fails
  • The buyer owes nothing
  • Equivalent circulating fulus can discharge the known price

Question 28

Which conclusion goes beyond Quduri’s stated obsolete-coin rule?

  • Obsolete coins may be specified as items of property
  • Ending circulation is relevant
  • Loss of circulation before payment is relevant
  • Treating every inflationary change as complete obsolescence

Question 29

Why must the earlier sarf-possession rule still be checked?

  • A different allocation does not cancel applicable mutual possession requirements
  • The disagreement is merely linguistic
  • Every fulus weighs the same as gold
  • Mutual possession applies only to loans

Question 30

Which heading follows Bab al-Sarf in Quduri?

  • Book of Pledges
  • Option of inspection
  • Book of Zakat
  • Salam

Question 31

Which set of distinctions summarises the level correctly?

  • Only metal colour, script and coin design
  • Price, clothing and weather
  • Usury is only ever about delay
  • Currency circulation, custom-determined quantity and allocation of countervalues

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