What is the wisdom behind prohibiting the exchange of old gold for new with the payment of a difference, while it is permissible to sell gold and then buy new gold with its price plus an increase?
Source: FtawySummarized from the full answer at Ftawy · imported Sep 2, 2026
The indicates the prohibition of riba al-fadl (usury of surplus), which is selling a usurious commodity of the same kind at a surplus. Scholars differed regarding the wisdom behind this prohibition. Some believe it was to set a limit for the bartering system and transition to using money as a medium, while others believe it is a measure to block the means (sadd al-dhara'i'), because riba al-fadl might lead to riba al-nasiah (usury of delay). A Muslim must submit to Allah's command, even if the wisdom behind it is not apparent to him.
Summarized from the full answer at Ftawy · imported
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