Mishkat al-Masabih #3265
Emancipation
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «الْمُكَاتَبُ عَبْدٌ مَا بَقِيَ عَلَيْهِ مِنْ مُكَاتبَته دِرْهَم» . رَوَاهُ أَبُو دَاوُد
‘Amr b. Shu'aib, on his father's authority, told that this grandfather reported the Prophet as saying, “A slave who has entered into an agreement to purchase his freedom is a slave as long as a dirham of the agreed price remains to be paid."
Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #3265 from Mishkat al-Masabih, in the Book of Emancipation.