"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).
أَنَّ نَبِيَّ اللَّهِ ﷺ قَالَ مَنْ خَصَى عَبْدَهُ خَصَيْنَاهُ وَمَنْ جَدَعَ عَبْدَهُ جَدَعْنَاهُ وَاللَّفْظُ لاِبْنِ بَشَّارٍ