Chapter on Tayammum and Its Rules
Tahdhīb al-Aḥkām|Volume 1|Book 1|Chapter 8
وَ كَذَلِكَ اَلْخَبَرُ اَلَّذِي رَوَاهُ مُحَمَّدُ بْنُ أَحْمَدَ بْنِ يَحْيَى عَنِ اَلْحَسَنِ بْنِ عَلِيٍّ عَنْ عَلِيِّ بْنِ أَسْبَاطٍ عَنْ يَعْقُوبَ بْنِ سَالِمٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَ: فِي رَجُلٍ تَيَمَّمَ وَ صَلَّى ثُمَّ أَصَابَ اَلْمَاءَ وَ هُوَ فِي وَقْتٍ قَالَ« قَدْ مَضَتْ صَلاَتُهُ وَ لْيَتَطَهَّرْ».
Muhammad ibn Ahmad ibn Yahya narrated from al-Hasan ibn Ali, from Ali ibn Asbat, from Ya‘qub ibn Salim:
Abu ‘Abdullah عليه السلام was asked regarding a man who performed tayammum and prayed, then found water while still within the time (for the prayer). Imam عليه السلام said: "His prayer is valid, and let him purify himself."
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 205
- Ṣaḥīḥ al-Tahdhīb, p. 101