Sahih Bukhari Volume 8, Book 80, Hadith Number 746.
Narrated By Al-Aswad : ‘Aisha bought Barira in order to manumit her, but her masters stipulated that her Wala’ (after her death) would be for them. ‘Aisha said, “O Allah’s Apostle! I have bought Barira in order to manumit her,…