Nafi' narrates from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that Sayyidah Aishah (may Allah be pleased with her) wanted to buy a slave girl and free her, so her owners said: The wala' will be ours; we will sell her to you. Sayyidah Aishah (may Allah be pleased with her) mentioned this to the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) said: "Let nothing prevent you from buying the slave girl, for the wala' belongs to the one who frees."
(b) Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates from Sayyidah Aishah (may Allah be pleased with her) that Sayyidah Aishah (may Allah be pleased with her) intended to buy a slave girl and free her.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10844