Mishkat al-Masabih #351
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ حُذَيْفَةَ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا قَامَ لِلتَّهَجُّدِ مِنَ اللَّيْلِ يَشُوصُ فَاهُ بِالسِّوَاكِ
Hudhaifa said that when the Prophet got up to pray during the night he cleansed his mouth with the tooth-stick.
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #351 from Mishkat al-Masabih, in the Book of Purification.