The Prophet [SAW] forbade mixing dried dates and raisins, and Al-Busr and ripe dates. (Using translation from Nasāʾī 5554)  

أَنَّ النَّبِيَّ ﷺ «نَهَى عَنْ خَلِيطِ التَّمْرِ وَالزَّبِيبِ وَالْبُسْرِ وَالرُّطَبِ»  

The Messenger of Allah [SAW] said: "Do not mix raisins and dried dates, nor Al-Busr and dried dates." (Using translation from Nasāʾī 5555)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «لَا تَخْلِطُوا الزَّبِيبَ وَالتَّمْرَ وَلَا الْبُسْرَ وَالتَّمْرَ»