It was narrated that Huthaifah said: "When the Messenger of Allah (ﷺ) got up at night, he would brush his mouth with the Siwak"
SahihSahihSahih - Agreed UponBook 1 · Hadith 2
سنن النسائي
It was narrated that Huthaifah said: "When the Messenger of Allah (ﷺ) got up at night, he would brush his mouth with the Siwak"