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