165 - وَ سُئِلَ اَلرِّضَا عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلرَّجُلِ يَطَأُ فِي اَلْحَمَّامِ وَ فِي رِجْلَيْهِ اَلشُّقَاقُ فَيَطَأُ اَلْبَوْلَ وَ اَلنُّورَةَ فَيَدْخُلُ اَلشُّقَاقَ أَثَرٌ أَسْوَدُ مِمَّا وَطِئَهُ مِنَ اَلْقَذَرِ وَ قَدْ غَسَلَهُ كَيْفَ يَصْنَعُ بِهِ وَ بِرِجْلِهِ اَلَّتِي وَطِئَ بِهَا أَ يُجْزِيهِ اَلْغَسْلُ أَمْ يُخَلِّلُ [أَظْفَارَهُ] بِأَظْفَارِهِ وَ يَسْتَنْجِي فَيَجِدُ اَلرِّيحَ مِنْ أَظْفَارِهِ وَ لاَ يَرَى شَيْئاً فَقَالَ «لاَ شَيْءَ عَلَيْهِ مِنَ اَلرِّيحِ وَ اَلشُّقَاقِ بَعْدَ غَسْلِهِ.
Hadith.165 - Imam Ali ibn Musa Ar-Ridha 
as asked about a man who steps in a public bath with cracked feet and steps on urine and lime, causing a black residue to enter the cracks. If he washes it, how should he treat it, and what about his foot that stepped on it? Is washing sufficient, or should he also scrape under his nails? And he washes himself, only to then find smell emanating from his nails even when there is nothing?
Imam said: ‘There is nothing on him from the smell or the residue in the cracks after washing’
