سَأَلَ زُرَارَةُ بْنُ أَعْيَنَ أَبَا جَعْفَرٍ وَ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: عَمَّا يَنْقُضُ اَلْوُضُوءَ فَقَالاَ «مَا خَرَجَ مِنْ طَرَفَيْكَ اَلْأَسْفَلَيْنِ اَلذَّكَرِ وَ اَلدُّبُرِ مِنْ غَائِطٍ أَوْ بَوْلٍ أَوْ مَنِيٍّ أَوْ رِيحٍ وَ اَلنَّوْمُ حَتَّى يُذْهِبَ اَلْعَقْلَ.
Zurarah ibn A'yan asked Imam Muhammad ibn Ali Al-Baqir (a.s) and Imam Jafar ibn Muhammad Al-Sadiq (a.s) about what nullifies wudu (ablution). They said: "Anything that exits from your two lower openings, the front (urethra) and the back (anus), such as excrement, urine, semen, or wind, as well as sleep that causes a loss of consciousness, invalidates wudu”.