Authentic
graded by Al-Albani
Mishkat al-Masabih 4177
وَعَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «طَعَامُ الِاثْنَيْنِ كَافِي الثلاثةِ وطعامِ الثلاثةِ كَافِي الْأَرْبَعَة»
He reported God’s messenger as saying, “Two people’s food is enough for three and three people’s is enough for four.” (Bukhari and Muslim.)
Cited in Mishkat al-Masabih (No. 4177).