It was narrated that 'Aishah said: "I bought Barirah and her masters stipulated that her Wala' should go to them. I mentioned that to the Prophet (ﷺ) and he said: 'Set her free, and Al-Wala' is to the one who pays the silver.' So I set her free and the Messenger of Allah (ﷺ) called her and gave her the choice concerning her husband. She said: 'Even if you gave me such and such, I would not stay with him,' so she chose herself and her husband was a free man."
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ، قَالَتِ اشْتَرَيْتُ بَرِيرَةَ فَاشْتَرَطَ أَهْلُهَا وَلاَءَهَا فَذَكَرْتُ ذَلِكَ لِلنَّبِيِّ صلى الله عليه وسلم فَقَالَ " أَعْتِقِيهَا فَإِنَّمَا الْوَلاَءُ لِمَنْ أَعْطَى الْوَرِقَ " . قَالَتْ فَأَعْتَقْتُهَا فَدَعَاهَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَخَيَّرَهَا مِنْ زَوْجِهَا قَالَتْ لَوْ أَعْطَانِي كَذَا وَكَذَا مَا أَقَمْتُ عِنْدَهُ . فَاخْتَارَتْ نَفْسَهَا وَكَانَ زَوْجُهَا حُرًّا .
sunnah.com