The Book Pertaining to Piety and Softening of Hearts (Kitab Al-Zuhd wa Al-Raqa'iq)
Muslim :: Book 42 : Hadith 7097
Abu Huraira reported: By Him in Whose Hand is my life and Ibn 'Abbad also said: By One in Whose hand is the life of Abu Huraira, Allah's Messenger (may peace be upon him) could not afford to provide adequate food to his family which could (fill their bellies) with bread and wheat for three days successively until he left the world.