(3) باب مَنْ بَاعَ عَلَى الضَّعِيفِ وَنَحْوِهِ
Narrated Jabir:
A man manumitted a slave and he had no other property than that, so the Prophet (ﷺ) canceled the manumission (and sold the slave for him). Nu'aim bin Al-Nahham bought the slave from him.
Reference: Sahih al-Bukhari 2415
In-book reference: Book 44, Hadith 6
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 41, Hadith 598