Sahih Bukhari Volume 2, Book 21, Hadith Number 237.
Narated By Hudhaifa : Whenever the Prophet got up for Tahajjud prayer he used to clean his mouth (and teeth) with Siwak.
Narated By Hudhaifa : Whenever the Prophet got up for Tahajjud prayer he used to clean his mouth (and teeth) with Siwak.