The next original rule concerns a sale contract in which the buyer promises to pledge a specified item as security for the price. Sale creates the obligation to pay; the promised pledge secures that obligation.
The question is not whether the price vanishes when the pledge is missing. It is whether the seller can compel delivery of the agreed collateral or obtain relief because the security condition is unfulfilled.
Opening interactive controls...
A sale that requires specified collateral
Kitab al-Rahn: Two Pledgees, Conditional Security and Custody
The next original rule concerns a sale contract in which the buyer promises to pledge a specified item as security for the price. Sale creates the obligation to pay; the promised pledge secures that obligation.
The question is not whether the price vanishes when the pledge is missing. It is whether the seller can compel delivery of the agreed collateral or obtain relief because the security condition is unfulfilled.