(21) باب إِثْمِ مَنْ تَبَرَّأَ مِنْ مَوَالِيهِ
Narrated Ibn `Umar:
The Prophet (ﷺ) forbade the selling of the Wala' (of slaves) or giving it as a present.
Reference: Sahih al-Bukhari 6756
In-book reference: Book 85, Hadith 33
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 80, Hadith 748