The goods owed under salam are a future obligation. If the price is also made payable later, both sides of the exchange become deferred and the tightly defined exception for salam is lost. Thus payment during the sitting is integral rather than optional.
With modern bank transfers, initiating a transfer and achieving legally effective receipt need not be identical moments. Constructive possession and particular payment rails require separate contemporary juristic analysis; Quduri's medieval text does not settle every digital settlement arrangement by itself.
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Why salam cannot become debt for debt
Bab al-Salam: Advance Price, Specified Goods, Delivery Date and Conditions
The goods owed under salam are a future obligation. If the price is also made payable later, both sides of the exchange become deferred and the tightly defined exception for salam is lost. Thus payment during the sitting is integral rather than optional.
With modern bank transfers, initiating a transfer and achieving legally effective receipt need not be identical moments. Constructive possession and particular payment rails require separate contemporary juristic analysis; Quduri's medieval text does not settle every digital settlement arrangement by itself.