If the original pledge is destroyed while its produce remains, the secured debt is apportioned between the original and the remaining produce when release is sought.
The portion allocated to the destroyed original is treated under the original pledge’s liability rule and falls from the debt, while the owner must discharge the portion allocated to the surviving increase to release it. Neither automatic free release nor charging the entire debt to the produce is the stated rule.
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Original lost while the increase survives
Kitab al-Rahn: Storage Costs, Growth and Additional Collateral
If the original pledge is destroyed while its produce remains, the secured debt is apportioned between the original and the remaining produce when release is sought.
The portion allocated to the destroyed original is treated under the original pledge’s liability rule and falls from the debt, while the owner must discharge the portion allocated to the surviving increase to release it. Neither automatic free release nor charging the entire debt to the produce is the stated rule.