Musnad Ahmad 1153:2298

Ya'qub narrated to us, he said: My father narrated to us, from Ibn Ishaq, he said: Muhammad ibn Muslim al-Zuhri and Hisham ibn 'Urwah ibn al-Zubayr narrated to me, both of them narrated to me from 'Urwah ibn al-Zubayr, from 'Aishah, she said: Barirah was with a slave, then she was emancipated. The Messenger of Allah, peace and blessings of Allah be upon him, placed her affair in her own hand.