Mishkat al-Masabih #410

Abu Huraira reported God's messenger as saying, “There is sexual defilement under every hair, so wash the hair and cleanse the skin.” Abu Dawud, Tirmidhi and Ibn Majah transmitted it, and Tirmidhi said, “This is a gharib tradition, and al-Harith b. Wajih who is the transmitter is a shaikh one cannot trust.”