Laws of Inheritance (Al-Faraa'id)
85/21. Chapter:
The sin of the freed slave who denies his master who has freed him.
Sahih Bukhari
حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ نَهَى النَّبِيُّ صلى الله عليه وسلم عَنْ بَيْعِ الْوَلاَءِ وَعَنْ هِبَتِهِ.
Narrated Ibn `Umar: The Prophet (ﷺ) forbade the selling of the Wala' (of slaves) or giving it as a present.
Reference : Sahih al-Bukhari 6756In-book reference : Book 85, Hadith 33USC-MSA web (English) reference : Vol. 8, Book 80, Hadith 748