(6) باب نواقض الوضوء
Also reported by Abu Da'ud mentioning the above addition without the words "the string is untied", but both versions are weak. (IT)
Reference (IT): Bulugh al-Maram 81 (IT)
In-book reference (IT): Book 1, Hadith 98 (IT)
English translation (IT): Book 1, Hadith 87 (IT)