Sunan an-Nasa'i, Book 45, Hadith 31 (In-Book) ⓘ
It was narrated from Samurah that the Messenger of Allah said: "Whoever kills his slave, we will kill him: whoever mutilates (his slave). We will mutilate him, and whoever castrates (his slave), we will castrate him."
أَخْبَرَنَا مَحْمُودُ بْنُ غَيْلاَنَ، - هُوَ الْمَرْوَزِيُّ - قَالَ حَدَّثَنَا أَبُو دَاوُدَ الطَّيَالِسِيُّ، قَالَ حَدَّثَنَا هِشَامٌ، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ سَمُرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " مَنْ قَتَلَ عَبْدَهُ قَتَلْنَاهُ وَمَنْ جَدَعَهُ جَدَعْنَاهُ وَمَنْ أَخْصَاهُ أَخْصَيْنَاهُ " .
also referenced under: Hadith 4736 (Reference) & Volume 5, Book 45, Hadith 4740 (DarusSalam)