One measure taken from a reasonably homogeneous heap is largely interchangeable with another. A random “one sheep” taken from a flock may instead differ in age, health and value.
The uncertainty is not just how many but which animal is being transferred.
Under Abu Hanifah's analysis, the validity of one qafiz does not carry over automatically to one unspecified sheep.
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Kitab al-Buyu: Grain Sales, Bulk Heaps, Qafiz and Unit Prices
One measure taken from a reasonably homogeneous heap is largely interchangeable with another. A random “one sheep” taken from a flock may instead differ in age, health and value.
The uncertainty is not just how many but which animal is being transferred.
Under Abu Hanifah's analysis, the validity of one qafiz does not carry over automatically to one unspecified sheep.