Language:
كتاب البيوع
34  
Sales and Trade
(82)
Chapter: The sale called Al-Muzabana; which is the sale of dried dates for fresh ones (that are still on the trees), and dried grapes for fresh grapes and the sale called Al-‘Araya (i.e., the selling of ripe fresh date, still over the palms, by means of estimation, for dry dates).
(82)
باب بَيْعِ الْمُزَابَنَة، وَهْيَ بَيْعُ الثَّمَرِ بِالتَّمْرِ وَبَيْعُ الزَّبِيبِ بِالْكَرْمِ وَبَيْعُ الْعَرَايَا
Sahih al-Bukhari 2185

Narrated `Abdullah bin `Umar:

Allah's Messenger (ﷺ) forbade Muzabana; and Muzabana means the selling of fresh dates (on the trees) for dried dates by measure and also the selling of fresh grapes for dried grapes by measure.

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنِ الْمُزَابَنَةِ‏.‏ وَالْمُزَابَنَةُ اشْتِرَاءُ الثَّمَرِ بِالتَّمْرِ كَيْلاً، وَبَيْعُ الْكَرْمِ بِالزَّبِيبِ كَيْلاً‏.‏
Reference : Sahih al-Bukhari 2185
In-book reference : Book 34, Hadith 132
USC-MSA web (English) reference : Vol. 3, Book 34, Hadith 390
  (deprecated numbering scheme)