The slave who is jointly owned by two persons, and is emancipated by one of them, (this one) has liability (upon him to secure complete freedom for that slave).  

عَنِ النَّبِيِّ ﷺ قَالَ فِي الْمَمْلُوكِ بَيْنَ الرَّجُلَيْنِ فَيُعْتِقُ أَحَدُهُمَا قَالَ يَضْمَنُ  

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.  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ أَعْتَقَ شِقْصًا لَهُ فِي عَبْدٍ فَخَلاَصُهُ فِي مَالِهِ إِنْ كَانَ لَهُ مَالٌ فَإِنْ لَمْ يَكُنْ لَهُ مَالٌ اسْتُسْعِيَ الْعَبْدُ غَيْرَ مَشْقُوقٍ عَلَيْهِ  

" If he (one of the joint owners emancipating the slave) has not (enough) money (to secure freedom for the other half) a fair price for the slave should be fixed, and he will be required to work to pay for his freedom, but must not be over-burdened.  

عَنْ سَعِيدِ بْنِ أَبِي عَرُوبَةَ بِهَذَا الإِسْنَادِ وَزَادَ إِنْ لَمْ يَكُنْ لَهُ مَالٌ قُوِّمَ عَلَيْهِ الْعَبْدُ قِيمَةَ عَدْلٍ ثُمَّ يُسْتَسْعَى فِي نَصِيبِ الَّذِي لَمْ يُعْتِقْ غَيْرَ مَشْقُوقٍ عَلَيْهِ  

A hadith like this is reported on the authority of the same chain of transmitters but with a slight change of words.  

سَمِعْتُ قَتَادَةَ يُحَدِّثُ بِهَذَا الإِسْنَادِ بِمَعْنَى حَدِيثِ ابْنِ أَبِي عَرُوبَةَ وَذَكَرَ فِي الْحَدِيثِ قُوِّمَ عَلَيْهِ قِيمَةَ عَدْلٍ