What did the Prophet Muhammad (saw) say about those who manumit and marry a slave-girl after teaching her good manners and improving her education?
 Narrated Abu Musa Al-Ash`ari:                     The Prophet said, "He who has a slave-girl and teaches her good manners and improves her education and then manumits and marries her, will get a double reward; and any slave who observes Allah's right and his master's right will get a double reward."