While relating the tradition about Barirah A’ishah said “her husband was a slave, so the Prophet(ﷺ) gave her choice. She chose herself. Had he been a free man, he would not given her choice.”
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرٌ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، فِي قِصَّةِ بَرِيرَةَ قَالَتْ كَانَ زَوْجُهَا عَبْدًا فَخَيَّرَهَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَاخْتَارَتْ نَفْسَهَا وَلَوْ كَانَ حُرًّا لَمْ يُخَيِّرْهَا .
AbuDaud
Divorce (Kitab Al-Talaq) • Hadith 2233