Messenger of Allah 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.
أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنِ الْمُزَابَنَةِ وَالْمُزَابَنَةُ بَيْعُ الثَّمَرِ بِالتَّمْرِ كَيْلاً وَبَيْعُ الزَّبِيبِ بِالْكَرْمِ كَيْلاً