Is there Riba al-Fadl in commodities that are consumed but are neither measured nor weighed?
Chapter on Riba (Usury) and Exchange (Sarf)
Al-Mughni
Book of Sales
Primary text
Riba does not apply to consumable items that are neither measured by weight nor volume, such as apples, pomegranates, peaches, watermelons, nuts, and eggs. This is based on the third narration regarding the 'illah, which requires both consumption and measurement/weight for Riba al-Fadl to apply.
Supporting text
The text implies that items possessing only the attribute of consumption, without a defined legal standard for equality (weight or measure), should revert to the general principle of permissibility, as a reliable proof for prohibition is lacking, and conflicting narrations necessitate discarding them or adhering to the basis of permissibility derived from the Quran and Sunnah.