Muwatta Malik · Hadith 1347

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

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).