If anyone emancipates a share in a slave, he is to be completely emancipated if he has money; but if he has none, the slave will be required to work to pay for his freedom, but must not be over-burhened. (Using translation from Muslim 1503a)
عَنِ النَّبِيِّ ﷺ قَالَ مَنْ أَعْتَقَ شَقِيصًا لَهُ فِي عَبْدٍ فَخَلَاصُهُ فِي مَالِهِ إِنْ كَانَ لَهُ مَالٌ فَإِنْ لَمْ يَكُنْ لَهُ مَالٌ اسْتُسْعِيَ الْعَبْدُ غَيْرَ مَشْقُوقٍ عَلَيْهِ