Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: "There are three people who will be given a double reward: one is the person from the People of the Book who believed in his own prophet and then, upon finding me, also believed in me; the second is the one who had a slave-girl, then freed her and married her; and the third is the slave who feared Allah and fulfilled the rights of his master."