LessonsKitab al-Rahn: Salam, Sarf, Third-party Custody and Fungible CollateralQuiz

Where the debt and perished collateral are fungibles of the same kind, the special classical rule offsets the debt by the equivalent quantity. This is a more precise rule than a generic appraisal of unrelated property.
If 100 silver dirhams are owed and 60 dirhams of the same kind are pledged and perish in the relevant custody, 60 dirhams of the debt are discharged; 40 remain. The whole debt does not vanish just because it was secured.

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Like-kind collateral is set off by its equivalent

Kitab al-Rahn: Salam, Sarf, Third-party Custody and Fungible Collateral

Where the debt and perished collateral are fungibles of the same kind, the special classical rule offsets the debt by the equivalent quantity. This is a more precise rule than a generic appraisal of unrelated property.
If 100 silver dirhams are owed and 60 dirhams of the same kind are pledged and perish in the relevant custody, 60 dirhams of the debt are discharged; 40 remain. The whole debt does not vanish just because it was secured.