Hadith 1410
عليكم بالسواك فنعم الشئ السواك . . . تحمده الملائكة و يرضي الرب و يسخط الشيطان
"Adhere to the use of the miswak; the miswak is the best thing... The angels praise the one who uses the miswak. (By using the miswak) the Lord becomes pleased and Satan becomes displeased."
