It is narrated from Hazrat Abu Musa (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Three types of people will receive a double reward: A man who has a slave-girl, and he teaches her good manners and gives her the best education, then sets her free and marries her, he will receive a double reward; likewise, a slave who fulfills the right of Allah and also fulfills the right of his master; or a man from the People of the Book who believed in his own scripture and also believed in the Shariah of Muhammad (peace and blessings be upon him), he too will receive a double reward.