صَحِيحُ الْبُخَارِيِّ
Sahih al-Bukhari 245
Ablutions (Wudu')
Siwak (to clean the teeth with Siwak which is a tooth-brush in the form of a pencil from the roots of the Arak tree
حَدَّثَنَا عُثْمَانُ، قَالَ حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ أَبِي وَائِلٍ، عَنْ حُذَيْفَةَ، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا قَامَ مِنَ اللَّيْلِ يَشُوصُ فَاهُ بِالسِّوَاكِ.
Narrated Hudhaifa: Whenever the Prophet (ﷺ) got up at night, he used to clean his mouth with Siwak.
Sahih al-Bukhari, 245Sahihصحيح