´It was narrated from Ibn 'Abbas tht the Prophet said:` "The Mukatab is free to the extent that the has paid off (toward buying his freedom); he Hadd punishment should be carried out on him proportionate to the amount he has paid off (toward buying his freedom); and he inherits proportionate to the amount he has paid off (toward buying his freedom)."
Hadith Referenceسنن نسائي / كتاب القسامة والقود والديات / 4815
Narrated Abdullah ibn Abbas: The Prophet ﷺ said: When a mukatab (a slave who has made an agreement to purchase his freedom) gifts blood-money or an inheritance, he can inherit in accordance with the extent to which he has been emancipated. Abu Dawud said: Wuhaib transmitted it from Ayyub, from Ikrimah, on the authority of Ali, from the Prophet ﷺ: and Hammad bin Zaid and Ismail have transmitted it in a mursal form (i. e the link of the Companion being missing) from Ayyub, from Ikrimah, from the Prophet ﷺ. Ismail bin 'Ulayyah has treated it as a statement of Ikrimah.
Shaykh Umar Farooq Saeedi
Benefits and Issues: The manner in which Islam has protected the rights of slaves is unmatched by any other nation. If a slave has become half-free and half-slave, then half of the blood money (diyah) will be paid as for a free person, and the remaining half as for a slave. Similarly, this ruling applies to other matters as well.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 4582