It is narrated from Jabir (may Allah be pleased with him) that a man from the Ansar 1 made his slave a mudabbar 2 (that is, he said to him: "You will be free after my death"), then he died, and he left no wealth except for this slave. So the Prophet (peace and blessings of Allah be upon him) sold him 3, and Nu‘aym bin ‘Abdullah bin Nahham bought him. Jabir says: He was a Coptic slave. In the first year of the governorship of ‘Abdullah bin Zubair (may Allah be pleased with them both), he died. Imam Tirmidhi says:
1- This hadith is hasan sahih.
2- This is also narrated from Jabir bin ‘Abdullah through other chains.
3- Some of the people of knowledge among the Companions and others have acted upon this. They do not see any harm in selling a mudabbar slave. This is also the view of Shafi‘i, Ahmad, and Ishaq bin Rahwayh.
4- And some of the people of knowledge among the Companions and others have considered the sale of a mudabbar to be disliked. This is the view of Sufyan Thawri, Malik, and Awza‘i.