حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ قَالَ أَمَرَ رَسُولُ اللَّهِ صلى الله عليه وسلم السَّعْدَيْنِ أَنْ يَبِيعَا آنِيَةً مِنَ الْمَغَانِمِ مِنْ ذَهَبٍ أَوْ فِضَّةٍ فَبَاعَا كُلَّ ثَلاَثَةٍ بِأَرْبَعَةٍ عَيْنًا أَوْ كُلَّ أَرْبَعَةٍ بِثَلاَثَةٍ عَيْنًا فَقَالَ لَهُمَا رَسُولُ اللَّهِ صلى الله عليه وسلم " أَرْبَيْتُمَا فَرُدَّا
Yahya related to me from Malik that Yahya ibn Said said, "TheMessenger of Allah, mayAllah bless him and grant him peace, orderedthe two Sads to sell a vessel made of either gold or silver from thebooty. They either sold each three units of weight for four units ofweight of coins or each four units of weight for three units of weightor coins. The Messenger of Allah, may Allah bless him and grant himpeace, said to them, 'You have taken usury, so return it.' " Translation Not Available
Book Ref: Muwatta Imam Malik Book 31 Hadith 1319
Web Ref: Muwatta Imam Malik Book 31 Hadith 28