Al-Kāfi

Hadith 109
prophet-muhammad
2ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ مَحْبُوبٍ عَنْ يُونُسَ بْنِ يَعْقُوبَ عَنْ أَبِي أُسَامَةَ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ مِنْ سُنَنِ الْمُرْسَلِينَ السِّوَاكُ.
2. A number of our people have narrated from Ahmad ibn Muhammad from ibn Mahbub from Yunus ibn Ya’qub from abu ‘Usamah who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘Brushing one’s teeth is of the traditions of the messengers (of Allah).”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī