Abu Dawud said: One version of Abu Musa has the wording: "he cut off his skin".
Another version of Abu Musa goes: "he cut off (part of) his body."
In-book : Book 1, Hadith 22
English translation : Book 1, Hadith 22
1. Purification (Kitab Al-Taharah)
باب الاِسْتِبْرَاءِ مِنَ الْبَوْلِ