صحيح البخاري Sahih Bukhari كتاب الشركة The Book of Partnership
بَابُ الْقِرَانِ فِي التَّمْرِ بَيْنَ الشُّرَكَاءِ حَتَّى يَسْتَأْذِنَ أَصْحَابَهُ:

(4) Chapter. A partner sharing a meal should not eat two dates at a time unless he gets the permission of his partner.

2 hadith
Hadith 2489
حَدَّثَنَا خَلَّادُ بْنُ يَحْيَى ، حَدَّثَنَا سُفْيَانُ ، حَدَّثَنَا جَبَلَةُ بْنُ سُحَيْمٍ ، قَالَ : سَمِعْتُ ابْنَ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا ، يَقُولُ : " نَهَى النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنْ يَقْرُنَ الرَّجُلُ بَيْنَ التَّمْرَتَيْنِ جَمِيعًا حَتَّى يَسْتَأْذِنَ أَصْحَابَهُ " .
Narrated Ibn `Umar: The Prophet decreed that one should not eat two dates together at a time unless he gets the permission from his companions (sharing the meal with him).
Hadith Reference Sahih Bukhari / The Book of Partnership / Hadith: 2489
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة
Hadith 2490
حَدَّثَنَا أَبُو الْوَلِيدِ ، حَدَّثَنَا شُعْبَةُ ، عَنْ جَبَلَةَ ، قَالَ : كُنَّا بِالْمَدِينَةِ فَأَصَابَتْنَا سَنَةٌ ، فَكَانَ ابْنُ الزُّبَيْرِ يَرْزُقُنَا التَّمْرَ ، وَكَانَ ابْنُ عُمَرَ يَمُرُّ بِنَا ، فَيَقُولُ : لَا تَقْرُنُوا ، فَإِنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ " نَهَى عَنِ الْإِقْرَانِ ، إِلَّا أَنْ يَسْتَأْذِنَ الرَّجُلُ مِنْكُمْ أَخَاهُ " .
Narrated Jabala: "While at Medina we were struck with famine. Ibn Az-Zubair used to provide us with dates as our food. Ibn `Umar used to pass by us and say, "Don't eat two dates together at a time as the Prophet has forbidden eating two dates together at a time (in a gathering) unless one takes the permission of one's companion brother."
Hadith Reference Sahih Bukhari / The Book of Partnership / Hadith: 2490
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة