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). Sahih al-Bukhari 2186
Arabic hadith text
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ دَاوُدَ بْنِ الْحُصَيْنِ، عَنْ أَبِي سُفْيَانَ، مَوْلَى ابْنِ أَبِي أَحْمَدَ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ـ رضى الله عنه أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنِالْمُزَابَنَةِ وَالْمُحَاقَلَةِ. وَالْمُزَابَنَةُ اشْتِرَاءُ الثَّمَرِ بِالتَّمْرِ فِي رُءُوسِ النَّخْلِ.
Translation
Narrated Abu Sa`id Al-Khudri
Allah's Messenger (ﷺ) forbade Muzabana and Muhaqala; and Muzabana means the selling of ripe dates for dates still on the trees.