فإن لم يكن له وصي نصب القاضي له وصيا وأمره ببيعه
Translation: If he has no executor, the judge appoints an executor for him and orders the sale of the pledge.
The absence of a waṣī is addressed through judicial appointment. The purpose is to secure repayment through lawful administration rather than allowing whichever person happens to possess the article to dispose of it on his own initiative.
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Original ruling: appointment by the judge
Kitab al-Rahn: Misuse, Loan Back, Liability and Death of the Pledgor
فإن لم يكن له وصي نصب القاضي له وصيا وأمره ببيعه
Translation: If he has no executor, the judge appoints an executor for him and orders the sale of the pledge.
The absence of a waṣī is addressed through judicial appointment. The purpose is to secure repayment through lawful administration rather than allowing whichever person happens to possess the article to dispose of it on his own initiative.