Chapter on Purifying Clothes and Other Items From Impurities
Tahdhīb al-Aḥkām|Volume 1|Book 1|Chapter 12
وَ بِهَذَا اَلْإِسْنَادِ عَنِ اَلْحُسَيْنِ بْنِ سَعِيدٍ عَنْ عُثْمَانَ بْنِ عِيسَى عَنْ سَمَاعَةَ قَالَ: سَأَلْتُ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنِ اَلرَّجُلِ يَرَى بِثَوْبِهِ اَلدَّمَ فَيَنْسَى أَنْ يَغْسِلَهُ حَتَّى يُصَلِّيَ قَالَ« يُعِيدُ صَلاَتَهُ كَيْ يَهْتَمَّ بِالشَّيْءِ إِذَا كَانَ فِي ثَوْبِهِ عُقُوبَةً لِنِسْيَانِهِ» قُلْتُ فَكَيْفَ يَصْنَعُ مَنْ لَمْ يَعْلَمْ أَ يُعِيدُ حِينَ يَرْفَعُهُ قَالَ« لاَ وَ لَكِنْ يَسْتَأْنِفُ».
With this chain of transmission, from Al-Husayn ibn Sa'id, from Uthman ibn Isa, from Sama'ah. He said:
I asked Abu Abdullah عليه السلام about a man who notices blood on his garment but forgets to wash it until he has already prayed. Imam عليه السلام said: "He must repeat his prayer so that he pays attention to such matters in his clothing, as a consequence for his forgetfulness." I said: "What about someone who was unaware of it - does he need to repeat the prayer after discovering it?" Imam عليه السلام said: "No, but he should start fresh (perform new prayers going forward)."
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 270
- Ṣaḥīḥ al-Tahdhīb, p. 26