Abu Dawud
Purification (Kitab Al-Taharah)
Book Number: 001 / Hadith Number: 102
Narated By N/A : Explaining the tradition of the Prophet (pbuh) that ablution of a person who does not mention the name of Allah (in the beginning) is valid, Rabi'ah said: The tradition means that if a person performs ablution and takes a bath but does not have the intention to perform ablution for prayer and purify himself from sexual defilement, his ablution or bath is not valid.