Sunan Abu Dawud #4517 · Types of Blood-Wit (Kitab Al-Diyat)

Sunan Abu DawudQatadah transmitted the tradition mentioned above through a chain of narrators like that of Shu'bah. This version adds
Sunan Abu Dawud · Book 41 · Types of Blood-Wit (Kitab Al-Diyat)
Sunan Abu Dawud · كتاب 41 · كتاب الديات
Then al-Hasan forgot this tradition, and he used to say: A free man is not to be killed for a slave
حَدَّثَنَا الْحَسَنُ بْنُ عَلِيٍّ، حَدَّثَنَا سَعِيدُ بْنُ عَامِرٍ، عَنِ ابْنِ أَبِي عَرُوبَةَ، عَنْ قَتَادَةَ، بِإِسْنَادِ شُعْبَةَ مِثْلَهُ زَادَ ثُمَّ إِنَّ الْحَسَنَ نَسِيَ هَذَا الْحَدِيثَ فَكَانَ يَقُولُ ‏
"‏ لاَ يُقْتَلُ حُرٌّ بِعَبْدٍ ‏"‏ ‏.‏
Reference : Sunan Abu Dawud 4517In-book reference : Book 41, Hadith 24