The Chapter of Siwak
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 12
وَقَالَ أَمِيرُ اَلْمُؤْمِنِينَ عَلَيْهِ اَلسَّلاَمُ: «إِنَّ أَفْوَاهَكُمْ طُرُقُ اَلْقُرْآنِ فَطَهِّرُوهَا بِالسِّوَاكِ.
The Commander of the Faithful Imam Ali ibn Abi Talib عليه السلام said: "Your mouths are the pathways of the Quran, so purify them with siwak (toothstick)."
- Ṣaḥīḥ al-Faqīh