Mishkat al-Masabih 14 Emancipation كتاب العتق 7

عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ أَعْتَقَ شِرْكًا لَهُ فِي عَبْدٍ وَكَانَ لَهُ مَالٌ يَبْلُغُ ثَمَنَ الْعَبْدِ قُوِّمَ الْعَبْدُ قِيمَةَ عَدْلٍ فَأُعْطِيَ شُرَكَاؤُهُ حِصَصَهُمْ وَعَتَقَ عَلَيْهِ الْعَبْدُ وَإِلَّا فَقَدْ عَتَقَ مِنْهُ مَا عَتَقَ»

Ibn ‘Umar reported God’s Messenger as saying, “If anyone emancipates his share in a slave and has enough money to pay the full price for him, a fair price for the slave should be fixed, his partners given their shares, and the slave be thus emancipated; otherwise he is emancipated only to the extent of the first man’s share.” (Bukhari and Muslim.)