Sahih al-Bukhari 97
Sahih al-Bukhari · Book 3: Knowledge · A man teaching (religion to) his woman-slave and his family
Narrated Abu Burda's father:
أَخْبَرَنَا مُحَمَّدٌ ـ هُوَ ابْنُ سَلاَمٍ ـ حَدَّثَنَا الْمُحَارِبِيُّ ، قَالَ حَدَّثَنَا صَالِحُ بْنُ حَيَّانَ ، قَالَ قَالَ عَامِرٌ الشَّعْبِيُّ حَدَّثَنِي أَبُو بُرْدَةَ ، عَنْ أَبِيهِ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " ثَلاَثَةٌ لَهُمْ أَجْرَانِ رَجُلٌ مِنْ أَهْلِ الْكِتَابِ آمَنَ بِنَبِيِّهِ، وَآمَنَ بِمُحَمَّدٍ صلى الله عليه وسلم وَالْعَبْدُ الْمَمْلُوكُ إِذَا أَدَّى حَقَّ اللَّهِ وَحَقَّ مَوَالِيهِ، وَرَجُلٌ كَانَتْ عِنْدَهُ أَمَةٌ {يَطَؤُهَا} فَأَدَّبَهَا، فَأَحْسَنَ تَأْدِيبَهَا، وَعَلَّمَهَا فَأَحْسَنَ تَعْلِيمَهَا، ثُمَّ أَعْتَقَهَا فَتَزَوَّجَهَا، فَلَهُ أَجْرَانِ " . ثُمَّ قَالَ عَامِرٌ أَعْطَيْنَاكَهَا بِغَيْرِ شَىْءٍ، قَدْ كَانَ يُرْكَبُ فِيمَا دُونَهَا إِلَى الْمَدِينَةِ .
Allah's Messenger (ﷺ) 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 (ﷺ) 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."