I heard Allah'. s Messenger ﷺ as saying: Food for one person suffices two persons and food for two persons suffices four persons, and food for four persons suffices eight persons; and in the tradition transmitted on the authority of Ishaq there is no mention of the fact that he heard it directly (from the Holy Prophet).
سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ طَعَامُ الْوَاحِدِ يَكْفِي الاِثْنَيْنِ وَطَعَامُ الاِثْنَيْنِ يَكْفِي الأَرْبَعَةَ وَطَعَامُ الأَرْبَعَةِ يَكْفِي الثَّمَانِيَةَ وَفِي رِوَايَةِ إِسْحَاقَ قَالَ رَسُولُ اللَّهِ ﷺ لَمْ يَذْكُرْ سَمِعْتُ