The Book of Faith (Kitab Al-Iman)
Muslim :: Book 1 : Hadith 402
Abu Huraira reported: When (this verse) was revealed to him:" Warn your nearest kinsmen." the Messenger of Allah (may peace be upon him) said: O people of Quraish, buy yourselves from Allah, I cannot avail you at all against Allah; O sons of Abd al-Muttalib. I cannot avail you at all against Allah; 0 Abbas b. 'Abd al- Muttalib, I cannot avail you at all against Allah; O Safiya (aunt of the Messenger of Allah), I cannot avail you at all against Allah; 0 Fatima, daughter of Muhammad, ask me whatever you like, but I cannot avail you at all against Allah.