Sayyiduna Samurah (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) used to say: "Whoever among you prepares food in the amount that suffices two men, it will suffice three; or prepares food that suffices four, it will suffice five."
Al-Bazzar and Tabarani recorded it. Al-Bazzar's chain contains Yusuf bin Khalid al-Samti, and he is da'if (weak); the chain of the other narration contains a group of narrators whom I do not know.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأطعمة / 7896