Reference: Sahih Bukhari (English),Volume 01,03. Knowledge,Hadith 097_01:- Narrated Abu Burda's father: Allah's Apostle said "Three persons will have a double reward: -1. A Person from the people of the scriptures who believed in his prophet (Jesus or Moses) and then believed in the Prophet Muhammad (i.e. has embraced Islam). -2. A slave who discharges his duties to Allah and his master. -3. A master of a woman-slave who teaches her good manners and educates her in the best possible way (the religion) and manumits her and then marries her." - #Hamras -