Musnad Ahmad 1153:879

'Affan narrated to us, he said: Abu 'Awanah narrated to us, he said: 'Umar ibn Abi Salamah narrated to us, from his father, from 'Aishah, from the Prophet, peace and blessings of Allah be upon him, who said: "The right of inheritance (al-wala') belongs to the one who emancipated."