Amr bin Dinar narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that a man of the Ansar made his slave a mudabbar, and he had no other wealth. The Messenger of Allah (peace and blessings be upon him) sold him; Ibn al-Nahham bought that Coptic slave, and he died in the year of Ibn al-Zubayr.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المدبر / 21534