It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The food of one person is sufficient for two people, the food of two is sufficient for four, and the food of four is sufficient for eight people."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 14222