Sahih al-Bukhari 2171

Arabic

حَدَّثَنَا إِسْمَاعِيلُ، حَدَّثَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنِ الْمُزَابَنَةِ، وَالْمُزَابَنَةُ بَيْعُ الثَّمَرِ بِالتَّمْرِ كَيْلاً، وَبَيْعُ الزَّبِيبِ بِالْكَرْمِ كَيْلاً‏.‏

English translation

Narrated Ibn `Umar:Allah's Messenger (ﷺ) forbade Muzabana; and Muzabana is the selling of fresh dates for dried old dates by measure, and the selling of fresh grapes for dried grapes by measure

Reference: Sahih al-Bukhari 2171, Book of Sales and Trade. English translation by Dr. Muhammad Muhsin Khan.