Musnad Ahmad 30:2780

Muhammad ibn Ja'far and Bahz narrated to us, they said: Shu'bah narrated to us, from Habib ibn Abi Thabit. Bahz said in his narration: He said: Habib ibn Abi Thabit informed me, he said: I heard 'Umarah ibn 'Umayr, from Abu al-Mutawwas, from his father, from Abu Hurayrah. And Muhammad ibn Ja'far said: From Ibn al-Mutawwas, from his father, from Abu Hurayrah, from the Prophet, may Allah bless him and grant him peace, that he said: "Whoever breaks his fast for one day in Ramadan without a concession that Allah has granted him, the fasting of a lifetime will not make up for it."