The Prophet ﷺ forbade the sale of fruits on the tree for fruits by measure, and sale of grapes for raisins by measure, and sale of harvest for wheat by measure.  

أَنَّ النَّبِيَّ ﷺ نَهَى عَنْ بَيْعِ الثَّمَرِ بِالتَّمْرِ كَيْلاً وَعَنْ بَيْعِ الْعِنَبِ بِالزَّبِيبِ كَيْلاً وَعَنْ بَيْعِ الزَّرْعِ بِالْحِنْطَةِ كَيْلاً