The Messenger of Allah ﷺ said: The eyes are the leather strap of the anus, so one who sleeps should perform ablution.  

قَالَ رَسُولُ اللَّهِ ﷺ وِكَاءُ السَّهِ الْعَيْنَانِ فَمَنْ نَامَ فَلْيَتَوَضَّأْ  

The Messenger of Allah said: "The eye is the leather strap (that ties up) the anus, so whoever falls asleep, let him perform ablution."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ الْعَيْنُ وِكَاءُ السَّهِ فَمَنْ نَامَ فَلْيَتَوَضَّأْ  

ʿThe anus, for the eye [in another version of this report, it says, ʿThe 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’.”  

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ السَّهَ وِكَاءُ الْعَيْنِ فَمَنْ نَامَ فَلْيَتَوَضَّأْ  

ʿThe anus, for the eye [in another version of this report, it says, ʿThe 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’.” (Using translation from Aḥmad 887)   

عَنْ رَسُولِ اللهِ ﷺ قَالَ إِنَّمَا الْعَيْنُ وِكَاءُ السَّهِ فَمَنْ نَامَ فَلْيَتَوَضَّأْ  

"وكَاءُ السَّهِ الْعَينَانِ، فَمْنَ نَامَ فَلْيَتَوَضَّأ".  

"إِنَّمَا العينانِ وكاءُ السهِ، فإِذا نامت العَيْنُ استطلَقَ الوكاءُ فمن نامَ فَلْيَتَوَضَّأ ".  

"إِنما العينُ وِكَاءُ السَّه فإذا نامت العينُ انطلَق الوكاءُ فمن نام فليتوضَّأ".