(33) باب فَضِيلَةِ الْمُوَاسَاةِ فِي الطَّعَامِ الْقَلِيلِ وَأَنَّ طَعَامَ الاِثْنَيْنِ يَكْفِي الثَّلاَثَةَ وَنَحْوِ ذَلِكَ
Jabir reported Allah's Messenger (ﷺ) as saying:
Food for one (person) suffices two, and food for two (persons) suffices four persons and food for four persons suffices eight persons.
Reference: Sahih Muslim 2059 d
In-book reference: Book 36, Hadith 245
USC-MSA web (English) reference(deprecated numbering scheme): Book 23, Hadith 5112