ولا يجوز التصرف في ثمن الصرف قبل قبضه
Translation: Disposing of the price of sarf before receiving it is impermissible.
Here disposal means entering a further transaction involving an exchange consideration that has not yet been received. Sarf requires receipt as a condition for the original contract to remain valid.
Selling onward the silver owed to one before actually receiving it illustrates the prohibited disposal.
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Disposal before receiving exchange money
Bab al-Sarf: Precious-Metal Exchange, Possession and Composite Goods
ولا يجوز التصرف في ثمن الصرف قبل قبضه
Translation: Disposing of the price of sarf before receiving it is impermissible.
Here disposal means entering a further transaction involving an exchange consideration that has not yet been received. Sarf requires receipt as a condition for the original contract to remain valid.
Selling onward the silver owed to one before actually receiving it illustrates the prohibited disposal.