Al-Kāfi - The Book of Taharat (Cleansing)

Al-Kāfi - The Book of Taharat (Cleansing) Chapter: Matters that Invalidate or Do not Invalidate Wudu’ َاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ وَ٠َّدُ بْنُ يَحْيَى عَنْ ٠َّدِ بْنِ الْحُسَيْنِ عَنْ صَفْوَانَ بْنِ يَحْيَى عَنْ عَبْدِ الرَّحْ٠َنِ بْنِ الْحَجَّاجِ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلا٠) عَنِ الْخَفْقَةِ وَالْخَفْقَتَيْنِ فَقَالَ ٠َا الْخَفْقَةُ وَالْخَفْقَتَانِ إِنَّ الله يَقُولُ بَلِ الإِنْسانُ عَلى‏ نَفْسِهِ بَصِيرَةٌ إِنَّ عَلِيّاً (عَلَيْهِ الْسَّلا٠اً أَوْ قَاعِداً فَقَدْ وَجَبَ عَلَيْهِ الْوُضُوءُ.

He (the Imam) said, ‘I do not know what slumbering once or twice is; however Allah says, “Man is well aware of his soul.” Ali (a.s.), would say, “If one feels the taste of sleep when standing or sitting, it then becomes necessary for him to take Wudu’.’”” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (3/120))