سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 1622
The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
Using siwak when getting up to pray at night
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ حُصَيْنٍ، قَالَ سَمِعْتُ أَبَا وَائِلٍ، يُحَدِّثُ عَنْ حُذَيْفَةَ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا قَامَ مِنَ اللَّيْلِ يَشُوصُ فَاهُ بِالسِّوَاكِ .
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.
Sunan an-Nasa'i, 1622Sahih (Darussalam)