Abu Dawud
Purification (Kitab Al-Taharah)
Book Number: 001 / Hadith Number: 350
Narated By Sa'id b. 'Abd Al-Aziz : Explaining the meaning of the words ghassala and ightasala (that occurs in tradition 345) Sa'id (b. 'Abd Al-Aziz) said: One should wash one's head and body well (and not that one should make one's wife wash).