Abu Dawud Book 1, Hadith Number 203.Abu Dawud Book 1. Purification Chapter : Performing ablution after awaking from sleep. Narated By Ali ibn Abu Talib : The Apostle of Allah (PBUH) said: The eyes are the leather strap of the anus, so one who sleeps should perform ablution. Related Previous Post Abu Dawud Book 1, Hadith Number 204. Next Post Abu Dawud Book 1, Hadith Number 202.