Yahya related to me from Malik that he had heard from his grandfather, Malik ibn Abi Amir that Uthman ibn Affan said, "The Messenger of Allah, may Allah bless him and grant him peace, said to me, 'Do not sell a dinar for two dinars nor a dirham for two dirhams.' "
Muwatta Malik Book 31, Hadith 32
← Previous Hadith Yahya related to me from Malik from Humayd ibn Qays al-Makki that Mujahid said, "I was with Abdullah ibn Umar and an artisan came to him and said, 'Abu Abd ar-Rahman - I fashion gold and then sell what I have made for more than its weight. I take an amount equivalent to the work of my hand.' Abdullah forbade him to do that, so the artisan repeated the question to him, and Abdullah continued to forbid him until he came to the door of the mosque or to an animal that he intended to mount. Then Abdullah ibn Umar said, 'A dinar for a dinar, and a dirham for a dirham. There is no increase between them. This is the command of ourProphet to us and our advice to you.' "

Muwatta Malik Book 31, Hadith 31 Next Hadith → Yahya related to me from Malik from Zayd ibn Aslam from Ata ibn Yasar that Muawiya ibn Abi Sufyan sold a gold or silver drinking- vessel for more than its weight. Abu'dDarda said, "I heard the Messenger of Allah, may Allah bless him and grant him peace, forbidding such sales except like for like." Muawiya said to him, "I don't see any harm in it." Abu'd-Darda said to him, "Who will excuse me from Muawiya? I tell him something from the Messenger of Allah, may Allah bless him and grant him peace, and he gives me his own opinion! I will not live in the same land as you!" Then Abu'd-Darda went to Umar ibn al-Khattab and mentioned that to him. Umar ibn al-Khattab therefore wrote to Muawiya, "Do not sell it except like for like, weight for weight."

Muwatta Malik Book 31, Hadith 33