Sahl b. Abu Hathma reported Messenger of Allah ﷺ having forbidden Muzabana, i. e. exchange of fresh dates with dry dates. except in case of those to whom donations of some trees have been made. It is for them that concession has been given.  

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنِ الْمُزَابَنَةِ الثَّمَرِ بِالتَّمْرِ إِلاَّ أَصْحَابَ الْعَرَايَا فَإِنَّهُ قَدْ أَذِنَ لَهُمْ  

Rafi bin Khadij and Sahl Bi Abi Hathamah narrated that the Messenger of Allah forbade Muzabanah, which means selling fresh dates still on the tree for dried dates, except in cases of 'Araya, for which he gave permission. (Sahih (Using translation from Nasāʾī 4543)  

أَنَّ رَسُولَ اللهِ ﷺ نَهَى عَنِ الْمُزَابَنَةِ الثَّمَرِ بِالتَّمْرِ إِلَّا أَصْحَابَ الْعَرَايَا فَإِنَّهُ قَدْ أَذِنَ لَهُمْ