Sunan an-Nasa'i, Volume 5, Book 45, Hadith 4758 (DarusSalam) ⓘ
It was narrated from Samurah that the Prophet of Allah said: "Whoever castrates his slave, we will castrate him, and whoever mutilates his slave, we will mutilate him." This is the wording of Ibn Bashshar (one of the narrators).
أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَمُحَمَّدُ بْنُ بَشَّارٍ، قَالاَ حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ، قَالَ حَدَّثَنِي أَبِي، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ سَمُرَةَ، أَنَّ نَبِيَّ اللَّهِ صلى الله عليه وسلم قَالَ " مَنْ خَصَى عَبْدَهُ خَصَيْنَاهُ وَمَنْ جَدَعَ عَبْدَهُ جَدَعْنَاهُ " . وَاللَّفْظُ لاِبْنِ بَشَّارٍ .
also referenced under: Hadith 4754 (Reference) & Book 45, Hadith 49 (In-Book)