"The Messenger of Allah ruled that in the case of a Mukatab, the Diyah should be (equivalent) to the Diyah for a free man, proportionate to the amount he had paid off (towards buying his freedom)."
Reference: Sunan an-Nasa'i 4810 In-book : Book 45, Hadith 105 English translation : Vol. 5, Book 45, Hadith 4814
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