عَنْ حُذَيْفَةَ رضي الله عنه قَالَ:
كَانَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ إِذَا قَامَ مِنَ اللَّيْلِ يَشُوصُ فَاهُ بِالسِّوَاكِ.
[صحيح] - [متفق عليه] - [صحيح البخاري: 245]
المزيــد ...
Hudhayfah (may Allah be pleased with him) reported:
When the Prophet (may Allah's peace and blessings be upon him) got up at night, he would cleanse his mouth with Siwak (tooth-stick).
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Bukhari - 245]
The Prophet (may Allah's peace and blessings be upon him) would often use the Siwāk and command the Muslims to use it. This practice was confirmed at certain times, like getting up during the night, as he (may Allah's peace and blessings be upon him) would brush and cleanse his mouth with the Siwāk.