Chapter on the Description of Ablution (Wudu)
Tahdhīb al-Aḥkām|Volume 1|Book 1|Chapter 4
عَنْهُ عَنْ عُثْمَانَ عَنْ سَمَاعَةَ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ:« مَنْ نَسِيَ مَسْحَ رَأْسِهِ أَوْ قَدَمَيْهِ أَوْ شَيْئاً مِنَ اَلْوُضُوءِ اَلَّذِي ذَكَرَهُ اَللَّهُ فِي اَلْقُرْآنِ كَانَ عَلَيْهِ إِعَادَةُ اَلْوُضُوءِ» وَ اَلصَّلاَةِ.
From him, from Uthman, from Sama’ah, from Abu Abdullah عليه السلام, who said:
Imam عليه السلام said: "Whoever forgets to wipe his head, his feet, or any part of the ablution mentioned by Allah سبحانه وتعالى in the Quran, it is obligatory upon him to repeat the ablution and the prayer."
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 106
- Ṣaḥīḥ al-Tahdhīb, p. 58