Muhammad bin al-Munkadir (may Allah have mercy on him) said that Sayyiduna Jabir (may Allah be pleased with him) said: A man made his slave a mudabbar, so the Prophet (peace and blessings be upon him) ordered that he be sold, and Nu'aym (may Allah be pleased with him) bought him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المدبر / 21559