The Prophet ﷺ said, "Whoever manumits a slave owned by two masters, should manumit him completely (not partially) if he is rich after having its price evaluated."  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ أَعْتَقَ عَبْدًا بَيْنَ اثْنَيْنِ فَإِنْ كَانَ مُوسِرًا قُوِّمَ عَلَيْهِ ثُمَّ يُعْتَقُ  

Messenger of Allah ﷺ said, "Whoever frees his share of a common slave and he has sufficient money to free him completely, should let its price be estimated by a just man and give his partners the price of their shares and manumit the slave; otherwise (i.e. if he has not sufficient money) he manumits the slave partially."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ أَعْتَقَ شِرْكًا لَهُ فِي عَبْدٍ فَكَانَ لَهُ مَالٌ يَبْلُغُ ثَمَنَ الْعَبْدِ قُوِّمَ الْعَبْدُ قِيمَةَ عَدْلٍ فَأَعْطَى شُرَكَاءَهُ حِصَصَهُمْ وَعَتَقَ عَلَيْهِ وَإِلاَّ فَقَدْ عَتَقَ مِنْهُ مَا عَتَقَ  

Messenger of Allah ﷺ said, "Whoever manumits his share of a slave, then it is essential for him to get that slave manumitted' completely as long as he has the money to do so. If he has not sufficient money to pay the price of the other shares (after the price of the slave is evaluated justly), the manumitted manumits the slave partially in proportion to his share. ʿUbaidullah narrated as above in brief.  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ أَعْتَقَ شِرْكًا لَهُ فِي مَمْلُوكٍ فَعَلَيْهِ عِتْقُهُ كُلِّهِ إِنْ كَانَ لَهُ مَالٌ يَبْلُغُ ثَمَنَهُ فَإِنْ لَمْ يَكُنْ لَهُ يُقَوَّمُ عَلَيْهِ قِيمَةَ عَدْلٍ فَأُعْتِقَ مِنْهُ مَا أَعْتَقَ حَدَّثَنَا مُسَدَّدٌ حَدَّثَنَا بِشْرٌ عَنْ عُبَيْدِ اللَّهِ اخْتَصَرَهُ  

The Prophet ﷺ said, "He who manumits his share of a slave and has money sufficient to free the remaining portion of that slave's price (justly estimated) then he should manumit him (by giving the rest of his price to the other co-owners)." Nafiʿ added, "Otherwise the slave is partially free." Aiyub is not sure whether the last statement was said by Nafiʿ or it was a part of the Hadith.  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ أَعْتَقَ نَصِيبًا لَهُ فِي مَمْلُوكٍ أَوْ شِرْكًا لَهُ فِي عَبْدٍ وَكَانَ لَهُ مِنَ الْمَالِ مَا يَبْلُغُ قِيمَتَهُ بِقِيمَةِ الْعَدْلِ فَهْوَ عَتِيقٌ قَالَ نَافِعٌ وَإِلاَّ فَقَدْ عَتَقَ مِنْهُ مَا عَتَقَ قَالَ أَيُّوبُ لاَ أَدْرِي أَشَىْءٌ قَالَهُ نَافِعٌ أَوْ شَىْءٌ فِي الْحَدِيثِ  

That he used to give his verdict regarding the male or female slaves owned by more than one master, one of whom may manumit his share of the slave. Ibn ʿUmar used to say in such a case, "The manumitted should manumit the slave completely if he has sufficient money to pay the rest of the price of that slave (which is to be justly estimated) and the other shareholders are to take the price of their shares and the slave is freed (released from slavery)." Ibn ʿUmar narrated this verdict from the Prophet.  

عَنِ النَّبِيِّ ﷺ وَرَوَاهُ اللَّيْثُ وَابْنُ أَبِي ذِئْبٍ وَابْنُ إِسْحَاقَ وَجُوَيْرِيَةُ وَيَحْيَى بْنُ سَعِيدٍ وَإِسْمَاعِيلُ بْنُ أُمَيَّةَ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ ؓ عَنِ النَّبِيِّ ﷺ مُخْتَصَرًا