Ma'tmar bin Sulaiman-al-Taufayl معتمر بن سليمان - الطفيل · The Book of Divorce

"Tell him to take her back and keep her until she becomes pure, then menstruates again and becomes pure again. Then if he wishes he may keep her, or if he wishes, he may divorce her before he touches (has intercourse with) her. This is the time when Allah, the Mighty and Sublime, has stated that women may be divorced."

"Al-Wala' is to the one who did the favor (of setting the slave free)." The Messenger of Allah gave her the choice, as her husband was a slave. And she gave some meat to 'Aishah as a gift, and the Messenger of Allah said: "Why don't you give me some of this meat?" 'Aishah said: "It was given in charity to Barirah." He said: "It is a charity for her, and a gift for us."