جاز التفاضل ووجب التقابض
Translation: Unequal amounts are allowed, but mutual possession is obligatory.
Gold and silver are different genera. Hence their weights need not match, yet both considerations must be received before the parties separate.
For example, exchanging 5 grams of gold for 400 grams of silver is not invalid merely because the weights differ. Both sides must nevertheless take possession within the contract session.
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Gold against silver
Bab al-Sarf: Precious-Metal Exchange, Possession and Composite Goods
جاز التفاضل ووجب التقابض
Translation: Unequal amounts are allowed, but mutual possession is obligatory.
Gold and silver are different genera. Hence their weights need not match, yet both considerations must be received before the parties separate.
For example, exchanging 5 grams of gold for 400 grams of silver is not invalid merely because the weights differ. Both sides must nevertheless take possession within the contract session.