وكل ما أمكن ضبط صفته ومعرفة مقداره جاز السلم فيه
Translation: Salam is permissible in whatever can be adequately specified in quality and quantity.
After the particular examples, Quduri states a general controlling principle: salam is permissible where the material attributes can be fixed reliably and the quantity can be determined. The principle explains the individual commodity rulings rather than replacing them.
Two distinct questions must be answered:
1. What kind of goods are owed? This concerns quality and description.
2. How much is owed? This concerns quantity.
Failure to settle either essential point can defeat a determinate obligation.
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The general governing principle
Bab al-Salam: Fabric, Gems, Bricks and Precise Specification
وكل ما أمكن ضبط صفته ومعرفة مقداره جاز السلم فيه
Translation: Salam is permissible in whatever can be adequately specified in quality and quantity.
After the particular examples, Quduri states a general controlling principle: salam is permissible where the material attributes can be fixed reliably and the quantity can be determined. The principle explains the individual commodity rulings rather than replacing them.
Two distinct questions must be answered:
1. What kind of goods are owed? This concerns quality and description.
2. How much is owed? This concerns quantity.
Failure to settle either essential point can defeat a determinate obligation.