Sahih al-Bukhari 2717
Narrated `Urwa:
Aisha told me that Barirah came to seek her help in writing for emancipation and at that time she had 
not paid any part of her price. `Aisha said to her, "Go to your masters and if they agree that I will pay 
your price (and free you) on condition that your Wala' will be for me, I will pay the money." Barirah 
told her masters about that, but they refused, and said, "If `Aisha wants to do a favor she could, but 
your Wala will be for us." Aisha informed Allah's Messenger (ﷺ) of that and he said to her, "Buy and 
manumit Barirah as the Wala' will go to the manumitted."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، أَنَّ عَائِشَةََ،ـ رضى الله عنها ـ أَخْبَرَتْهُ أَنَّ بَرِيرَةَ جَاءَتْ عَائِشَةَ تَسْتَعِينُهَا فِي كِتَابَتِهَا، وَلَمْ تَكُنْ قَضَتْ مِنْ كِتَابَتِهَا شَيْئًا، قَالَتْ لَهَا عَائِشَةُ ارْجِعِي إِلَى أَهْلِكِ، فَإِنْ أَحَبُّوا أَنْ أَقْضِيَ عَنْكِ كِتَابَتَكِ، وَيَكُونَ وَلاَؤُكِ لِي فَعَلْتُ‏.‏ فَذَكَرَتْ ذَلِكَ بَرِيرَةُ إِلَى أَهْلِهَا فَأَبَوْا وَقَالُوا إِنْ شَاءَتْ أَنْ تَحْتَسِبَ عَلَيْكِ فَلْتَفْعَلْ، وَيَكُونَ لَنَا وَلاَؤُكِ‏.‏ فَذَكَرَتْ ذَلِكَ لِرَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَ لَهَا ‏
"‏ ابْتَاعِي فَأَعْتِقِي، فَإِنَّمَا الْوَلاَءُ لِمَنْ أَعْتَقَ ‏"‏‏.‏