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bukhari:2525Aḥmad b. Miqdām > al-Fuḍayl b. Sulaymān > Mūsá b. ʿUqbah > Nāfiʿ > Ibn ʿUmar > Kān

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.  

البخاري:٢٥٢٥حَدَّثَنَا أَحْمَدُ بْنُ مِقْدَامٍ حَدَّثَنَا الْفُضَيْلُ بْنُ سُلَيْمَانَ حَدَّثَنَا مُوسَى بْنُ عُقْبَةَ أَخْبَرَنِي نَافِعٌ عَنِ ابْنِ عُمَرَ ؓ أَنَّهُ كَانَ يُفْتِي فِي الْعَبْدِ أَوِ الأَمَةِ يَكُونُ بَيْنَ شُرَكَاءَ فَيُعْتِقُ أَحَدُهُمْ نَصِيبَهُ مِنْهُ يَقُولُ قَدْ وَجَبَ عَلَيْهِ عِتْقُهُ كُلِّهِ إِذَا كَانَ لِلَّذِي أَعْتَقَ مِنَ الْمَالِ مَا يَبْلُغُ يُقَوَّمُ مِنْ مَالِهِ قِيمَةَ الْعَدْلِ وَيُدْفَعُ إِلَى الشُّرَكَاءِ أَنْصِبَاؤُهُمْ وَيُخَلَّى سَبِيلُ الْمُعْتَقِ يُخْبِرُ ذَلِكَ ابْنُ عُمَرَ

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