LessonsBab al-Salam: Fabric, Gems, Bricks and Precise SpecificationQuiz

Salam creates an obligation to supply goods defined in the seller's liability by reproducible specifications, not a claim to one uniquely identified extant fabric piece. Where equivalent cloth can ordinarily be supplied to the agreed specification, the form makes commercial sense.
A demand for one irreplaceable antique textile is different: no stable equivalent can be supplied by description alone. Calling that bargain “salam” does not automatically make its subject matter sufficiently determined.

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Why cloth can be described rather than individually selected

Bab al-Salam: Fabric, Gems, Bricks and Precise Specification

Salam creates an obligation to supply goods defined in the seller's liability by reproducible specifications, not a claim to one uniquely identified extant fabric piece. Where equivalent cloth can ordinarily be supplied to the agreed specification, the form makes commercial sense.
A demand for one irreplaceable antique textile is different: no stable equivalent can be supplied by description alone. Calling that bargain “salam” does not automatically make its subject matter sufficiently determined.