Musnad Ahmad 30:1480

Hassan narrated to us, Ibn Lahi'ah narrated to us, Abd al-Rahman al-A'raj narrated to us, I heard Abu Hurairah saying: The Messenger of Allah, peace and blessings of Allah be upon him, said to the Banu Abd al-Muttalib: "O Banu Abd al-Muttalib, buy yourselves from Allah. O Banu Hashim, buy yourselves from Allah. O Banu Abd Manaf, buy yourselves from Allah. O Umm al-Zubayr, the paternal aunt of the Messenger of Allah, and O Fatimah, daughter of Muhammad, buy yourselves from Allah, for I possess no power to avail you against Allah in anything. And ask me for whatever you wish."