Sahih Muslim 1501
Sahih Muslim · Book 27: The Book of Oaths · One who frees his share in a slave
Ibn 'Umar reported Allah's Apostle (ﷺ) as saying:
وَحَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ ، أَخْبَرَنَا مَعْمَرٌ ، عَنِ الزُّهْرِيِّ ، عَنْ سَالِمٍ ، عَنِ ابْنِ عُمَرَ ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " مَنْ أَعْتَقَ شِرْكًا لَهُ فِي عَبْدٍ عَتَقَ مَا بَقِيَ فِي مَالِهِ إِذَا كَانَ لَهُ مَالٌ يَبْلُغُ ثَمَنَ الْعَبْدِ " .
He who gives up his share in a slave, the remaining (share) will be paid out of his riches if his riches are enough to meet the price of the slave.