وَجُعِلَ كُلُّ وَاحِدٍ مِنَ الْجِنْسَيْنِ بِالْجِنْسِ الْآخَرِ
Translation: Each of the two genera is allocated against the other genus.
The 2 silver dirhams on the first side are matched with the 2 gold dinars on the second, while the 1 gold dinar is matched with the 1 silver dirham. Unequal amounts of the same metal are not matched directly.
This describes the legal construction of the one contract, not the creation of two new deals. The session-possession requirement remains.
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Allocating each metal against the other
Bab al-Sarf: Mixed Currency Exchanges, Debased Coins and Obsolescence
وَجُعِلَ كُلُّ وَاحِدٍ مِنَ الْجِنْسَيْنِ بِالْجِنْسِ الْآخَرِ
Translation: Each of the two genera is allocated against the other genus.
The 2 silver dirhams on the first side are matched with the 2 gold dinars on the second, while the 1 gold dinar is matched with the 1 silver dirham. Unequal amounts of the same metal are not matched directly.
This describes the legal construction of the one contract, not the creation of two new deals. The session-possession requirement remains.