Chapter on Rules of Janabah and Methods of Purification
Tahdhīb al-Aḥkām|Volume 1|Book 1|Chapter 6
اَلْخَبَرُ اَلَّذِي رَوَاهُ مُحَمَّدُ بْنُ أَحْمَدَ بْنِ يَحْيَى مُرْسَلاً:« بِأَنَّ اَلْوُضُوءَ قَبْلَ اَلْغُسْلِ وَ بَعْدَهُ بِدْعَةٌ».
The report narrated by Muhammad ibn Ahmad ibn Yahya as a mursal (chainless) narration states:
"Performing wudu before and after ghusl is an innovation (bid‘ah)."
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 147
- Ṣaḥīḥ al-Tahdhīb