The Chapter of Siwak
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 12
وَ رُوِيَ: «لَوْ عَلِمَ اَلنَّاسُ مَا فِي اَلسِّوَاكِ لَأَبَاتُوهُ مَعَهُمْ فِي لِحَافٍ.
It is narrated: "If people knew what benefits siwak holds, they would keep it with them in their bedding at night."
- Ṣaḥīḥ al-Faqīh