Laws of Inheritance (Al-Faraa'id)
حَدَّثَنَا إِسْمَاعِيلُ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنِي مَالِكٌ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِنَّمَا الْوَلاَءُ لِمَنْ أَعْتَقَ ".Narrated Ibn `Umar:The Prophet (ﷺ) said, "The Wala' is for the manumitted (of the slave)
From Sahih al-Bukhari, whose reports the scholars accept as authentic.