Sahih al-Bukhari 2504
Narrated Abu Huraira:
The Prophet (ﷺ) said, "Whoever manumits his share of a jointly possessed slave, it is essential for him to 
manumit the slave completely if he has sufficient money. Otherwise he should look for some work for 
the slave (to earn what would enable him to emancipate himself), without overburdening him with 
work."
حَدَّثَنَا أَبُو النُّعْمَانِ، حَدَّثَنَا جَرِيرُ بْنُ حَازِمٍ، عَنْ قَتَادَةَ، عَنِ النَّضْرِ بْنِ أَنَسٍ، عَنْ بَشِيرِ بْنِ نَهِيكٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏
"‏ مَنْ أَعْتَقَ شِقْصًا لَهُ فِي عَبْدٍ، أُعْتِقَ كُلُّهُ إِنْ كَانَ لَهُ مَالٌ، وَإِلاَّ يُسْتَسْعَ غَيْرَ مَشْقُوقٍ عَلَيْهِ ‏"‏‏.‏