"The Messenger of Allah was asked about (buying) fresh dates with dried dates, and he said to those who were around him: 'Will fresh dates decrease (in weight or volume) when they dry out?" they said Yes,' so he forbade that."  

سُئِلَ رَسُولُ اللَّهِ ﷺ عَنِ التَّمْرِ بِالرُّطَبِ فَقَالَ لِمَنْ حَوْلَهُ أَيَنْقُصُ الرُّطَبُ إِذَا يَبِسَ قَالُوا نَعَمْ فَنَهَى عَنْهُ  

"The Messenger of Allah was asked about (buying) said; 'Will fresh dates decrees (in weight or volume) when they dry out? 'They said 'yes so he forbade that"  

سُئِلَ رَسُولُ اللَّهِ ﷺ عَنِ الرُّطَبِ بِالتَّمْرِ فَقَالَ أَيَنْقُصُ إِذَا يَبِسَ قَالُوا نَعَمْ فَنَهَى عَنْهُ