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 Referenceصحيح البخاري / كتاب الشركة / 2489
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
Explanation: 1: This will be done by one who is extremely greedy and covetous regarding food, and who has absolutely no consideration for the other people eating with him. Therefore, one should avoid such greed and covetousness, especially when the quantity of food is limited. This prohibition pertains to eating collectively in a group setting.
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 1814