(12) باب مَنْ أَعْتَقَ شِرْكًا لَهُ فِي عَبْدٍ
Ibn 'Umar reported Allah's Messenger (ﷺ) as saying:
He who emancipates his share in the slave, it is his responsibility to secure full freedom for him provided he (the slave) has enough money to pay the (remaining) price, but it he has not so much money he would be emancipated to the extent that the first man emancipated.
Reference: Sahih Muslim 1501 d
In-book reference: Book 27, Hadith 74
USC-MSA web (English) reference(deprecated numbering scheme): Book 15, Hadith 4103