Musnad Ahmad 30:574

'Abd al-Razzaq narrated to us, Ibn Jurayj informed us, and Ibn Bakr said: Ibn Jurayj informed us, Ibn Shihab narrated to me, from Humayd ibn 'Abd al-Rahman, that Abu Hurayrah narrated to him: That the Prophet, peace and blessings of Allah be upon him, ordered a man who broke his fast during Ramadan to free a slave, or to fast for two months, or to feed sixty poor people.