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