Batalnya wudhu: tali pantat adalah kedua mata, maka barangsiapa yang tidur, hendaklah dia berwudhu
Imam Ahmad : 845حَدَّثَنَا عَلِيُّ بْنُ بَحْرٍ حَدَّثَنَا بَقِيَّةُ بْنُ الْوَلِيدِ الْحِمْصِيُّ حَدَّثَنِي الْوَضِينُ بْنُ عَطَاءٍ عَنْ مَحْفُوظِ بْنِ عَلْقَمَةَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ عَائِذٍ الْأَزْدِيِّ عَنْ عَلِيِّ بْنِ أَبِي طَالِبٍ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِنَّ السَّهَ وِكَاءُ الْعَيْنِ فَمَنْ نَامَ فَلْيَتَوَضَّأْ
Narrated to us [Ali bin Bahr] has told me [Baqiyyah bin Al Walid Al Himshi] has told me [Al Wadlin bin 'Atho`] from [Mahfuzh bin 'Alqamah] from [Abdurrahman bin 'A`idz Al Azdi] from [Ali bin Abu Talib] from the Prophet peace be upon him, he said: "The rectum is the eye string, whoever wants to sleep must perform ablution.