عَنْ سَعْدٍ مَوْلَى أَبِي بَكْرٍ رَضِيَ اللَّهُ عَنْهُ قَالَ قَدَّمْتُ بَيْنَ يَدَيْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ تَمْرًا فَجَعَلُوا يَقْرُنُونَ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ لَا تَقْرُنُوا
Mawla Abu Bakr Sayyiduna Sa'd (may Allah be pleased with him) narrates: He says, I presented dates before the Noble Prophet (peace and blessings be upon him). People began to put two or three dates together in their mouths. So the Noble Prophet (peace and blessings be upon him) said: Do not eat by mixing them like this (i.e., eat one date at a time, not two or three together).