If the buyer refuses to supply the named security, the seller has two responses:
1. Accept the sale without the pledge, relinquishing the extra security requirement.
2. Rescind the sale because an agreed protective feature has not been supplied.
This is a remedy for the failed collateral condition, not permission to collect the purchase price twice or treat the absence of security as automatically extinguishing the debt.
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The seller has two basic responses
Kitab al-Rahn: Two Pledgees, Conditional Security and Custody
If the buyer refuses to supply the named security, the seller has two responses:
1. Accept the sale without the pledge, relinquishing the extra security requirement.
2. Rescind the sale because an agreed protective feature has not been supplied.
This is a remedy for the failed collateral condition, not permission to collect the purchase price twice or treat the absence of security as automatically extinguishing the debt.