(10) باب مَا يَفْعَلُ إِذَا قَامَ مِنَ اللَّيْلِ مِنَ السِّوَاكِ
It was narrated from Hudhaifah that:
When the Prophet (ﷺ) got up to pray at night, he would brush his teeth with the siwak.
Reference: Sunan an-Nasa'i 1621
In-book reference: Book 20, Hadith 24
English translation: Vol. 2, Book 20, Hadith 1622