(13) Marriage
كتاب النكاح
(6a) Chapter - Section 1
(6) باب - الفصل الأول
Mishkat al-Masabih 3198 
'Urwa told on' A’isha’s authority that God’s Messenger said to her concerning Barira, “Take her and set her free.” Now her husband was a slave, so God’s Messenger gave her her choice and she chose to separate from him; but if he had been free he would not have given her her choice. (Bukhari and Muslim.)
عَنْ عُرْوَةَ عَنْ عَائِشَةَ: أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ لَهَا فِي بَرِيرَةَ: «خُذِيهَا فَأَعْتِقِيهَا» . وَكَانَ زَوْجُهَا عَبْدًا فَخَيَّرَهَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَاخْتَارَتْ نَفسهَا وَلَو كَانَ حرا لم يخيرها
 مُتَّفق عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 3198
In-book reference : Book 13, Hadith 116