ثُمَّ عَلِمَ أَنَّهُ كَانَ زُيُوفًا
Translation: Then he discovered that they were debased dirhams.
Zuyūf are dirhams below the expected standard or containing defect or debasement. This is a classical discussion of coins that matched a monetary count yet differed in quality; it is not a blanket ruling about modern illegal counterfeit notes.
Someone owes 100 sound dirhams and pays 100 substandard ones. The creditor unknowingly spends them, only later discovering their lower quality. The disagreement that follows concerns precisely this sequence of receipt, expenditure and later discovery.
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What debased or defective dirhams mean
Kitab al-Rahn: Salam, Sarf, Third-party Custody and Fungible Collateral
ثُمَّ عَلِمَ أَنَّهُ كَانَ زُيُوفًا
Translation: Then he discovered that they were debased dirhams.
Zuyūf are dirhams below the expected standard or containing defect or debasement. This is a classical discussion of coins that matched a monetary count yet differed in quality; it is not a blanket ruling about modern illegal counterfeit notes.
Someone owes 100 sound dirhams and pays 100 substandard ones. The creditor unknowingly spends them, only later discovering their lower quality. The disagreement that follows concerns precisely this sequence of receipt, expenditure and later discovery.