The Book of Purification
2/15. Chapter:
Siwak (tooth-stick)
Sahih Muslim
حَدَّثَنَا يَحْيَى بْنُ حَبِيبٍ الْحَارِثِيُّ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ غَيْلاَنَ، - وَهُوَ ابْنُ جَرِيرٍ الْمَعْوَلِيُّ - عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى، قَالَ دَخَلْتُ عَلَى النَّبِيِّ صلى الله عليه وسلم وَطَرَفُ السِّوَاكِ عَلَى لِسَانِهِ .
Abu Musa reported: I went to the Apostle (ﷺ) and found one end of the tooth-stick upon his tongue (i. e. he was rinsing his mouth).
Reference : Sahih Muslim 254In-book reference : Book 2, Hadith 59USC-MSA web (English) reference : Book 2, Hadith 490