(10) باب مَا يَفْعَلُ إِذَا قَامَ مِنَ اللَّيْلِ مِنَ السِّوَاكِ
It was narrated that Hudhaifah said:
"When the Messenger of Allah (ﷺ) got up to pray tahajjud at night, he would brush his teeth with the siwak.
Reference: Sunan an-Nasa'i 1622
In-book reference: Book 20, Hadith 25
English translation: Vol. 2, Book 20, Hadith 1623