"I bought Barirah and her masters stipulated that her loyalty (Wala) should be to them, I mentioned that to the Prophet and he said: 'Set her free, and loyalty belongs to the one who pays the silver.''' She said: "so I set her free. The Messenger of Allah called her and gave her the choice regarding her husband, and she chose herself. Her husband was a free man." (Using translation from Nasāʾī 4642)  

قَالَتِ اشْتَرَيْتُ بَرِيرَةَ فَاشْتَرَطَ أَهْلُهَا وَلَاءَهَا فَذَكَرْتُ ذَلِكَ لِلنَّبِيِّ ﷺ فَقَالَ «أَعْتِقِيهَا فَإِنَّ الْوَلَاءَ لِمَنْ أَعْطَى الْوَرِقَ» قَالَتْ فَعَتَقْتُهَا قَالَتْ فَدَعَاهَا رَسُولُ اللهِ ﷺ فَخَيَّرَهَا مِنْ زَوْجِهَا فَاخْتَارَتْ نَفْسَهَا وَكَانَ زَوْجُهَا حُرًّا  

she wanted to buy Barirah to set her free, but they stipulated that her loyalty (should be to them. She mentioned that to the Messenger of Allah and the Messenger of Allah said: "Buy her, and wet her free and loyalty (Wala) belongs to the one who sets the slave free." Some meat was brought to the Messenger of and it was said that this had been given in charity to Bariirah. He said: "It is charity for her, and a gift for us." And she was given the choice (Using translation from Nasāʾī 4643)  

أَنْ تَشْتَرِيَ بَرِيرَةَ لِعِتْقٍ وَأَنَّهُمُ اشْتَرَطُوا وَلَاءَهَا فَذَكَرَتْ ذَلِكَ لِرَسُولِ اللهِ ﷺ فَقَالَ «اشْتَرِيهَا فَأَعْتِقِيهَا فَإِنَّ الْوَلَاءَ لِمَنْ أَعْتَقَ» وَأُتِيَ رَسُولُ اللهِ ﷺ بِلَحْمٍ فَقَالُوا هَذَا تُصُدِّقَ بِهِ عَلَى بَرِيرَةَ فَقَالَ هُوَ لَهَا صَدَقَةٌ وَلَنَا هَدِيَّةٌ وَخُيِّرَتْ  

Aisha, (mother of the faithful believers) wanted to buy a slave girl and manumit her, but her masters said that they would sell her only on the condition that her Wala' would be for them. ʿAisha told Messenger of Allah ﷺ of that. He said, "What they stipulate should not hinder you from buying her, as the Wala' is for the manumitted." (Using translation from Bukhārī 2169)   

أَنَّ الْوَلَاءَ لَنَا فَذَكَرْتُ ذَلِكَ لِرَسُولِ اللهِ ﷺ فَقَالَ «لَا يَمْنَعُكِ ذَلِكَ فَإِنَّمَا الْوَلَاءُ لِمَنْ أَعْتَقَ»