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.
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The disciples: separating the valid portion
Bab al-Sarf: Circulating Fulus, Obsolete Coins and Money-Changer Exchanges
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.