"The Messenger of Allah said: 'There are three who will be given a twofold reward: A man who has a slave woman whom he disciplines and disciplines her well, and teaches and teaches her well, then he manumits her and marries her; a slave who fulfills his duty toward Allah and toward his masters; and a believer from among the People of the Book.'"  

قَالَ رَسُولُ اللَّهِ ﷺ ثَلاَثَةٌ يُؤْتَوْنَ أَجْرَهُمْ مَرَّتَيْنِ رَجُلٌ كَانَتْ لَهُ أَمَةٌ فَأَدَّبَهَا فَأَحْسَنَ أَدَبَهَا وَعَلَّمَهَا فَأَحْسَنَ تَعْلِيمَهَا ثُمَّ أَعْتَقَهَا وَتَزَوَّجَهَا وَعَبْدٌ يُؤَدِّي حَقَّ اللَّهِ وَحَقَّ مَوَالِيهِ وَمُؤْمِنُ أَهْلِ الْكِتَابِ  

"The Messenger of Allah said: 'Whoever manumits his female slave, then marries her, he will have two rewards.'"  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ أَعْتَقَ جَارِيَتَهُ ثُمَّ تَزَوَّجَهَا فَلَهُ أَجْرَانِ