(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. (ES)
Reference (ES): Bulugh al-Maram 81 (ES)
In-book reference (ES): Book 1, Hadith 98 (ES)
English translation (ES): Book 1, Hadith 87 (ES)