Narrated Mutarrif from `Imran Ibn Husain: That the Prophet asked him (Imran) or asked a man and `Imran was listening, O Abu so-and-so! Have you fasted the last days of this month? (The narrator thought that he said, the month of Ramadan ). The man replied, No, O Allah's Apostle! The Prophet said to him, When you finish your fasting (of Ramadan) fast two days (in Shawwal). Through another series of narrators `Imran said, The Prophet said, '(Have you fasted) the last days of Sha'ban?