'Amro bin Shu’aib narrated on the authority of his father, on the authority of his grandfather (RAA), That the Messenger of Allah (ﷺ) said:

“A slave who entered into an agreement to buy his freedom is still a slave as long as a Dirham of the agreed price remains to be paid.” Related by Abu Dawud with a good chain of narrators. The full hadith is related by Ahmad and the three Imams. Al-Hakim graded it to be Sahih.

وَعَنْ عَمْرِو بْنِ شُعَيْبٍ, عَنْ أَبِيهِ, عَنْ جَدِّهِ, عَنْ اَلنَّبِيِّ ‏- صلى الله عليه وسلم ‏-{ قَالَ:

اَلْمُكَاتَبُ عَبْدٌ مَا بَقِيَ عَلَيْهِ مِنْ مُكَاتَبَتِهِ دِرْهَمٌ

} أَخْرَجَهُ أَبُو دَاوُدَ بِإِسْنَادٍ حَسَن ٍ [1]‏ وَأَصْلُهُ عِنْدَ أَحْمَدَ, وَالثَّلَاثَةِ, وَصَحَّحَهُ اَلْحَاكِم ُ [2]‏ .‏