LessonsBab al-Sarf: Mixed Currency Exchanges, Debased Coins and ObsolescenceQuiz

وَقَالَ مُحَمَّدٌ: عَلَيْهِ قِيمَتُهَا آخِرَ مَا تَعَامَلَ النَّاسُ بِهَا
Translation: Muhammad considers the value due to be that of the last time people transacted with those coins.
His benchmark is the last day of circulation. Both disciples preserve the basic sale with value-substitution, but they differ over the date on which the vanished currency is valued.

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Muhammad: value when circulation last existed

Bab al-Sarf: Mixed Currency Exchanges, Debased Coins and Obsolescence

وَقَالَ مُحَمَّدٌ: عَلَيْهِ قِيمَتُهَا آخِرَ مَا تَعَامَلَ النَّاسُ بِهَا
Translation: Muhammad considers the value due to be that of the last time people transacted with those coins.
His benchmark is the last day of circulation. Both disciples preserve the basic sale with value-substitution, but they differ over the date on which the vanished currency is valued.