Hadith 44

Bulugh al-Maram

Book 8: Marriage
وَلِمُسْلِمٍ عَنْهَا : { أَنَّ زَوْجَهَا كَانَ عَبْدًا } 1‏ .‏
Muslim has from 'Aishah (RA):

"Her husband was a slave."