Hadith 513490
Chapter 31: Business Transactions - كتاب البيوع
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عُثْمَانَ بْنَ عَفَّانَ، كَانَ يَنْهَى عَنِ الْحُكْرَةِ، .
Yahya related to me from Malik that he had heard that Uthman ibn Affan forbade hoarding .
Reference Muwatta Malik 513490
USC-MSA web (English) reference : Book 31, Hadith 58