Sahih al-Bukhari · The Book of Manumission (of Slaves)

5- 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 · references 2526–2527