Hadith 41:25
Sahih Maqtu' (Al-Albani)
It was narrated from Hisham, from Qatadah, from Al-Hasan, who said:
"A free man should not be subjected to retaliation in return for a slave."
حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا هِشَامٌ، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، قَالَ لاَ يُقَادُ الْحُرُّ بِالْعَبْدِ
Original Reference: Sunan Abi Dawud 4518