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It was narrated from Hudhaifah that:

When the Prophet ﷺ got up to pray at night, he would brush his teeth with the siwak.
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، وَمُحَمَّدُ بْنُ الْمُثَنَّى، عَنْ عَبْدِ الرَّحْمَنِ، عَنْ سُفْيَانَ، عَنْ مَنْصُورٍ، وَالأَعْمَشِ، وَحُصَيْنٍ، عَنْ أَبِي وَائِلٍ، عَنْ حُذَيْفَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ إِذَا قَامَ مِنَ اللَّيْلِ يَشُوصُ فَاهُ بِالسِّوَاكِ ‏.‏

Classification

Sahih (Authentic)

References

• Sunan an-Nasa'i, 1621
• Sunan an-Nasa'i, Vol. 2, Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day, Hadith 1622
• Sunan an-Nasa'i, Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day, Hadith 1622