21.237 http://www.mohammeds-koran.com/texts/hadith/bukhari/21/21.237 http://www.mohammeds-koran.com/@@site-logo/Jihad_Sword_White_Background.png 21.237 Narrated Hudhaifa : Whenever the Prophet got up for Tahajjud prayer he used to clean his mouth (and teeth) with Siwak.