Language:
كتاب العتق
49  
Manumission of Slaves
(17)
Chapter: It is dislike to look down upon a slave
(17)
باب كَرَاهِيَةِ التَّطَاوُلِ عَلَى الرَّقِيقِ
Sahih al-Bukhari 2553

Narrated Ibn `Umar:

The Prophet (ﷺ) said, "If one manumits his share of a common slave (Abd), and he has money sufficient to free the remaining portion of the price of the slave (justly estimated), then he should free the slave completely by paying the rest of his price; otherwise the slave is freed partly. "

حَدَّثَنَا أَبُو النُّعْمَانِ، حَدَّثَنَا جَرِيرُ بْنُ حَازِمٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ مَنْ أَعْتَقَ نَصِيبًا لَهُ مِنَ الْعَبْدِ، فَكَانَ لَهُ مِنَ الْمَالِ مَا يَبْلُغُ قِيمَتَهُ، يُقَوَّمُ عَلَيْهِ قِيمَةَ عَدْلٍ، وَأُعْتِقَ مِنْ مَالِهِ، وَإِلاَّ فَقَدْ عَتَقَ مِنْهُ ‏"‏‏.‏
Reference : Sahih al-Bukhari 2553
In-book reference : Book 49, Hadith 36
USC-MSA web (English) reference : Vol. 3, Book 46, Hadith 729
  (deprecated numbering scheme)