she freed Barirah and the Messenger of Allah ﷺ gave her the choice, and she (Barirah) had a free husband.  

أَنَّهَا أَعْتَقَتْ بَرِيرَةَ فَخَيَّرَهَا رَسُولُ اللَّهِ ﷺ وَكَانَ لَهَا زَوْجٌ حُرٌّ  

"The husband of Barirah was a slave called Mughith. It is as if I can see him now, walking behind her and weeping, with tears running down his cheeks. The Prophet ﷺ said to 'Abbas: 'O Abbas, are you not amazed by the love of Mughith for Barirah, and the hatred of Barirah for Mughith?' And the Prophet said to her: Why don’t you take him back, for he is the father of your child?' She said: 'O Messenger of Allah, are you commanding me (to do so)?' He said: 'No, rather I am interceding.' She said: 'I have no need of him.' "  

يُقَالُ لَهُ مُغِيثٌ كَأَنِّي أَنْظُرُ إِلَيْهِ يَطُوفُ خَلْفَهَا وَيَبْكِي وَدُمُوعُهُ تَسِيلُ عَلَى خَدِّهِ فَقَالَ النَّبِيُّ ﷺ لِلْعَبَّاسِ يَا عَبَّاسُ أَلاَ تَعْجَبُ مِنْ حُبِّ مُغِيثٍ بَرِيرَةَ وَمِنْ بُغْضِ بَرِيرَةَ مُغِيثًا فَقَالَ لَهَا النَّبِيُّ ﷺ لَوْ رَاجَعْتِيهِ فَإِنَّهُ أَبُو وَلَدِكِ قَالَتْ يَا رَسُولَ اللَّهِ تَأْمُرُنِي قَالَ إِنَّمَا أَشْفَعُ قَالَتْ لاَ حَاجَةَ لِي فِيهِ  

the Messenger of Allah ﷺ gave Barirah the choice.  

أَنَّ رَسُولَ اللَّهِ ﷺ خَيَّرَ بَرِيرَةَ  

'Three Sunan were established because of Barirah: She was given the choice (of whether to remain married) when she was freed, and her husband was a slave; they used to give her charity and she used to give it as a gift to the Prophet ﷺ, and he would say: 'It is charity for her and a gift for us,' and he said, the 'Wala' is for the one who set the slave free.'"  

مَضَى فِي بَرِيرَةَ ثَلاَثُ سُنَنٍ خُيِّرَتْ حِينَ أُعْتِقَتْ وَكَانَ زَوْجُهَا مَمْلُوكًا وَكَانُوا يَتَصَدَّقُونَ عَلَيْهَا فَتُهْدِي إِلَى النَّبِيِّ ﷺ فَيَقُولُ هُوَ عَلَيْهَا صَدَقَةٌ وَهُوَ لَنَا هَدِيَّةٌ وَقَالَ الْوَلاَءُ لِمَنْ أَعْتَقَ  

"Barirah was told to observe the waiting period for three menstrual cycles."  

أَنْ تَعْتَدَّ بِثَلاَثِ حِيَضٍ