صحيح البخاري
Sahih Bukhari
كتاب العتق
The Book of Manumission (of Slaves)
بَابُ إِذَا أَعْتَقَ نَصِيبًا فِي عَبْدٍ، وَلَيْسَ لَهُ مَالٌ، اسْتُسْعِيَ الْعَبْدُ غَيْرَ مَشْقُوقٍ عَلَيْهِ، عَلَى نَحْوِ الْكِتَابَةِ:
(5) Chapter. Whoever manumits his portion of a common slave and does not possess enough money to manumit him completely, then that slave should be helped to work without hardship to earn what will enable him to get complete freedom according to the writing (of emancipation)
2 hadith
Hadith 2526
Narrated Abu Huraira: That the Prophet said, "Whoever frees his portion of a (common) slave."
Hadith 2527
Narrated Abu Huraira: The Prophet said, "Whoever frees his portion of a common slave should free the slave completely by paying the rest of his price from his money if he has enough money; otherwise the price of the slave is to be estimated and the slave is to be helped to work without hardship till he pays the rest of his price."