Hadith 43256

وَعَن مُعَاوِيَة بن أبي سُفْيَان أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: قَالَ: «إِنَّمَا الْعَيْنَانِ وِكَاءُ السَّهِ فَإِذَا نَامَتِ الْعَيْنُ اسْتطْلقَ الوكاء» . رَوَاهُ الدِّرَامِي

Mu'awiya b. Abu Sufyan reported the Prophet as saying, “The eyes are the leather strap of the anus, and when the eye sleeps the leather strap is loosened.” Darimi transmitted it.

Source: Mishkat al-Masabih — repository translation · Al-Khatib Al-Tabrizi — authenticity/grade metadata requires independent source review · Sunnah.com
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Source: Mishkat al-Masabih — repository arabic · Al-Khatib Al-Tabrizi · Sunnah.com