Volume 3 · Book 41 · Hadith 598
Narrated Jabir: A man manumitted a slave and he had no other property than that, so the Prophet cancelled the manumission (and sold the slave for him). No'aim bin Al-Nahham bought the slave from him.
— Sahih Bukhari, Volume 3, Book 41: Loans, Payment of Loans, Freezing of Property, Bankruptcy, Hadith #598