ENOfficial
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.)
Source: sunnah.com
Other translations
Arabic
وَعَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «طَعَامُ الِاثْنَيْنِ كَافِي الثلاثةِ وطعامِ الثلاثةِ كَافِي الْأَرْبَعَة»
sunnah.com