Cloth measured under strong tension may register a different length from cloth allowed to sag excessively. The commentaries discuss moderate measurement rather than unusual stretching or slackening.
If a delivery promises 20 metres, the seller cannot satisfy the quantity merely by stretching the fabric beyond an ordinary measuring state. The aim is a repeatable and fair measurement, not just stating the name of a unit while using it inconsistently.
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The method of measurement matters
Bab al-Salam: Fabric, Gems, Bricks and Precise Specification
Cloth measured under strong tension may register a different length from cloth allowed to sag excessively. The commentaries discuss moderate measurement rather than unusual stretching or slackening.
If a delivery promises 20 metres, the seller cannot satisfy the quantity merely by stretching the fabric beyond an ordinary measuring state. The aim is a repeatable and fair measurement, not just stating the name of a unit while using it inconsistently.