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