Musnad Ahmad 27:1853

'Abd al-Razzaq narrated to us, Ibn Jurayj informed us, he said: Sulayman ibn Musa, Nafi' narrated to us, from 'Abd Allah ibn 'Umar: "That the Messenger of Allah, may Allah bless him and grant him peace, decreed that the right of inheritance (al-wala') belongs to the one who emancipated (the slave)."