Sunan Ibn Majah — The Chapters on Manumission (of Slaves) — Hadith No: 2513
Translation
It was narrated that Jabir bin 'Abdullah said:“A man among us promised freedom to a slave after his death, and he did not have any property other than him (this slave). So the Prophet (ﷺ) sold him, and Ibn (Nahham), a man from Banu 'Adi, bought him.”