The Chapter of Siwak
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 12
وَقَالَ اَلصَّادِقُ عَلَيْهِ اَلسَّلاَمُ: «أَرْبَعٌ مِنْ سُنَنِ اَلْمُرْسَلِينَ اَلتَّعَطُّرُ وَ اَلسِّوَاكُ وَ اَلنِّسَاءُ وَ اَلْحِنَّاءُ.
Imam Jafar ibn Muhammad Al-Sadiq عليه السلام said: "Four practices are from the traditions of the messengers: applying fragrance, using siwak (toothstick), having relations with women, and using henna."
- Ṣaḥīḥ al-Faqīh