The Chapter of Siwak
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 12
وَقَالَ اَلنَّبِيُّ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «لَوْ لاَ أَنْ أَشُقَّ عَلَى أُمَّتِي لَأَمَرْتُهُمْ بِالسِّوَاكِ عِنْدَ وُضُوءِ كُلِّ صَلاَةٍ.
The Prophet صلى الله عليه وعلى آله وسلم said: "If it were not burdensome for my community, I would have commanded them to use siwak (tooth cleaning) with each wudu (ablution) before every prayer."
- Ṣaḥīḥ al-Faqīh