Sahih Muslim 2045
Sahih Muslim · Book 36: The Book of Drinks · The prohibition of eating two dates etc., at a time when eating with a group, except with the permission of one's companions
Jabala b. Suhaim reported:
حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ ، وَمُحَمَّدُ بْنُ الْمُثَنَّى ، قَالاَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ ، عَنْ سُفْيَانَ ، عَنْ جَبَلَةَ بْنِ سُحَيْمٍ ، قَالَ سَمِعْتُ ابْنَ عُمَرَ ، يَقُولُ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ يَقْرِنَ الرَّجُلُ بَيْنَ التَّمْرَتَيْنِ حَتَّى يَسْتَأْذِنَ أَصْحَابَهُ .
I heard Ibn 'Umar as saying that Allah's Messenger (ﷺ) forbade anyone taking two dates together without seeking the consent of his companions.