Hadith 723
حَدَّثَنَا عَفَّانُ، حَدَّثَنَا وُهَيْبٌ، حَدَّثَنَا أَيُّوبُ، عَنْ عِكْرِمَةَ، عَنْ عَلِيِّ بْنِ أَبِي طَالِبٍ، رَضِيَ اللَّهُ عَنْهُ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ يُودَى الْمُكَاتَبُ بِقَدْرِ مَا أَدَّى.
It was narrated from `Ali bin Abi Talib (رضي الله عنه) that The Prophet (ﷺ) said:
`Blood money will be paid for the mukatab (a slave with a contract of manumission) commensurate with as much as he had paid off.`
Reference : Musnad Ahmad 723
In-book reference : Book 5, Hadith 156