حَدَّثَنَا 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
مسند امام احمد بن حنبل · Hadith 887
It was narrated from 'Ali bin Abi Talib that the Prophet (PBUH) said: "The anus, for the eye [in another version of this report, it says: 'The eye, for the anus.., which sounds more apt], is like the string that ties up a waterskin; whoever goes to sleep, let him do wudoo'.”
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020