Ibrahim bin Abi Talib said: Al-Aswad bin Yazid differed from the people concerning the husband of Sayyidah Barirah (may Allah be pleased with her); he says that he was free, while the people say that he was a slave.
(b) Al-Aswad narrates from Sayyidah Aishah (may Allah be pleased with her): one of the two says that when Sayyidah Barirah (may Allah be pleased with her) was freed, he was a slave at that time, and the other said that he was a slave of the family of Abu Ahmad.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14280