Chapter on Obligatory and Recommended Ritual Washing
Tahdhīb al-Aḥkām|Volume 1|Book 1|Chapter 5
رَوَى مَا ذَكَرْنَاهُ أَحْمَدُ بْنُ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ سَهْلٍ عَنْ أَبِيهِ قَالَ: سَأَلْتُ أَبَا اَلْحَسَنِ عَلَيْهِ اَلسَّلاَمُ عَنِ اَلرَّجُلِ يَدَعُ غُسْلَ يَوْمِ اَلْجُمُعَةِ نَاسِياً أَوْ غَيْرَ ذَلِكَ قَالَ« إِنْ كَانَ نَاسِياً فَقَدْ تَمَّتْ صَلاَتُهُ وَ إِنْ كَانَ مُتَعَمِّداً فَالْغُسْلُ أَحَبُّ إِلَيَّ وَ إِنْ هُوَ فَعَلَ فَلْيَسْتَغْفِرِ اَللَّهَ وَ لاَ يَعُودُ».
Ahmad ibn Muhammad narrated from Muhammad ibn Sahl, from his father, who said:
I asked Abu al-Hasan عليه السلام about a man who misses the ghusl of Friday, whether out of forgetfulness or for another reason. Imam عليه السلام said: 'If he forgot, his prayer is valid. If he left it intentionally, the ghusl is more beloved to me. If he did this intentionally, let him seek forgiveness from Allah سبحانه وتعالى and not repeat it.'"
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 118
- Ṣaḥīḥ al-Tahdhīb, p. 64