وبإناء بعينه لا يعرف مقداره
Translation: Sale may also be made using a specifically identified vessel, even if its numerical capacity is unknown.
The words bi-ina'in bi-'aynihi require a particular vessel: this container, not an arbitrary one chosen later. Its volume need not be translated into a standard numerical unit.
What matters is that the physical measure is identified and stable enough to guide delivery.
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Kitab al-Buyu: Grain Sales, Bulk Heaps, Qafiz and Unit Prices
وبإناء بعينه لا يعرف مقداره
Translation: Sale may also be made using a specifically identified vessel, even if its numerical capacity is unknown.
The words bi-ina'in bi-'aynihi require a particular vessel: this container, not an arbitrary one chosen later. Its volume need not be translated into a standard numerical unit.
What matters is that the physical measure is identified and stable enough to guide delivery.