Bismillah-Hirrahman-Nirrahim
Hadith:
Us shaksh ka wudhu nahi jisney iskey shuru mein BISMILLAH na parhi ho
Hazrat Abu huraira radi Alllahu anhu se rivayat hai ki RASOOLALLAH sallAlllahu alaihi wasallam ne farmaya ki us shaksh ki namaz nahi jiska wudhu nahi aur us shaksh ka wudhu nahi jisney iskey shuru mein BISMILLAH na parhi ho
Sunan Abu Dawud, Vol 1, 101
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Narrated AbuHurairah Radi Alllahu Anhu The Messenger of ALLAH peace be upon him said: The prayer of a person who does not perform ablution is not valid, and the ablution of a person who does not mention the name of ALLAH (in the beginning) is not valid.
Sunan Abu Dawud,
Book 1, Number 101