Chapter on the Description of Ablution (Wudu)
Tahdhīb al-Aḥkām|Volume 1|Book 1|Chapter 4
وَ رَوَوْا أَيْضاً عَنِ اِبْنِ عَبَّاسٍ: أَنَّهُ وَصَفَ وُضُوءَ رَسُولِ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ فَمَسَحَ عَلَى رِجْلَيْهِ.
It was also narrated from Ibn Abbas that: "He described the ablution of the Messenger of Allah سبحانه وتعالى (peace and blessings be upon him and his family), and he (Prophet صلى الله عليه وعلى آله وسلم) wiped over his feet."
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 66
- Ṣaḥīḥ al-Tahdhīb, p. 52