94. Narrated Aboo Moosa (radhi Allaahu anhu) : Allaah’s Messenger (Sallallaahu Alaihi Wasallam) said,
Three persons will have a double reward :
A person from the people of the scriptures (a Jew or a Christian) who believed in his Prophet [‘Iesa (Jesus) or Moosa (Moses) (Alaihi Salaam) ] and then believed in Prophet Muhammad (Sallallaahu Alaihi Wasallam) (i.e. has embraced Islaam).
A slave who fulfills his duties to Allaah (Subhanahu wata’alaa) and also to his master.
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.
[Saheeh Al-Bukhaari, Hadeeth No. 97-A, Vol. 1]
Source : The Book of Belief : Chapter 68 – It is obligatory to have belief in our Prophet Muhammad (Sallallaahu Alaihi Wasallam) and that he has been sent as Allaah’s Messenger to all mankind, and the cancellation of all other religions (other than Islaam) with his religion (Islaam). Al-Lulu Wal-Marjan,Compiled by : Fuwad Abdul-Baqi,Translated by : Dr. Muhammad Muhsin Khan