Narrated Al-Aswad: Aisha intended to buy Barira, but her masters stipulated that her wala wound be for them. Aisha mentioned that to the Prophet who said (to `Aisha), "Buy and manumit her, for the wala is for the one who manumits." Once some me; was brought to the Prophet and was said, "This meat was given in charity to Barira. " The Prophet said, "It an object of charity for Barira and present for us." Narrated Adam: Shu`ba relate the same Hadith and added: Barira was given the option regarding her husband.
USC-MSA web (English) Reference: Volume 7, Book 63, Number 207
تخریج الحدیث دارالدعوه: «أحاديث صحيح البخاريّ كلّها صحيحة»