The Book Pertaining to Piety and Softening of Hearts (Kitab Al-Zuhd wa Al-Raqa'iq)
Muslim :: Book 42 : Hadith 7081
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: 0 Allah, provide for the, family of Muhammad their subsistence, and in the narration transmitted on the authority of 'Amr (the words are):" O Allah, provide us subsistence"