Yahya related to me from Malik from Nafi from Abdullah ibn Umar that Umar ibn al-Khattab said, "Do not sell gold for gold except like for like, and do not increase one part over another part. Do not sell silver for silver except like for like, and do not increase one part over another part. Do not sell silver for gold, one of them at hand and the other to be given later. If someone seeks to delay paying you until he has been to his house, do not leave him. I fear rama for you." Rama is usury.
Muwatta Malik Book 31, Hadith 34
← Previous 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 Next Hadith → Yahya related to me from Malik from Abdullah ibn Dinar from Abdullah ibn Umar that Umar ibn al-Khattab said, "Do not sell gold for gold except like for like. Do not increase part of it over another part. Do not sell silver for silver except like for like, and do not increase part of it over another part. Do not sell some of it which is there for some of it which is not. If someone asks you to wait for payment until he has been to his house, do not leave him. I fear rama for you." Rama is usury.

Muwatta Malik Book 31, Hadith 34