Allah's Messenger (ﷺ) said, any man who has a slave girl whom he educates properly, teaches good manners, manumits and marries her, will get a double reward And if any man of the people of the Scriptures believes in his own prophet and then believes in me too, he will (also) get a double reward And any slave who fulfills his duty to his master and to his Lord, will (also) get a double reward."
Reference: Sahih al-Bukhari 5083 In-book : Book 67, Hadith 21 USC-MSA web (English) : Vol. 7, Book 62, Hadith 20 (deprecated)
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