Chapter on Obligatory and Recommended Ritual Washing
Tahdhīb al-Aḥkām|Volume 1|Book 1|Chapter 5
فَأَمَّا مَا رَوَاهُ مُحَمَّدُ بْنُ عَلِيِّ بْنِ مَحْبُوبٍ عَنْ أَحْمَدَ بْنِ اَلْحَسَنِ بْنِ عَلِيٍّ عَنْ عَمْرِو بْنِ سَعِيدٍ عَنْ مُصَدِّقِ بْنِ صَدَقَةَ عَنْ عَمَّارٍ اَلسَّابَاطِيِّ قَالَ: سَأَلْتُ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنِ اَلرَّجُلِ يَنْسَى اَلْغُسْلَ يَوْمَ اَلْجُمُعَةِ حَتَّى صَلَّى قَالَ «إِنْ كَانَ فِي وَقْتٍ فَعَلَيْهِ أَنْ يَغْتَسِلَ وَ يُعِيدَ اَلصَّلاَةَ وَ إِنْ مَضَى اَلْوَقْتُ فَقَدْ جَازَتْ صَلاَتُهُ».
As for the narration reported by Muhammad ibn Ali ibn Mahbub, from Ahmad ibn al-Hasan ibn Ali, from Amr ibn Sa’id, from Musaddiq ibn Sadaqah, from Ammar al-Sabati, who said:
I asked Abu Abdullah عليه السلام about a man who forgets to perform the ghusl on Friday until after he has prayed. Imam عليه السلام said: 'If it is still within the time (of the prayer), he must perform the ghusl and repeat the prayer. But if the time has passed, his prayer is valid.'"
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 118
- Ṣaḥīḥ al-Tahdhīb