Purification (Kitab Al-Taharah)
1/49. Chapter:
Saying 'Bismillah' While Starting Wudu'
Sunan Abi Dawud
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا مُحَمَّدُ بْنُ مُوسَى، عَنْ يَعْقُوبَ بْنِ سَلَمَةَ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ صَلاَةَ لِمَنْ لاَ وُضُوءَ لَهُ وَلاَ وُضُوءَ لِمَنْ لَمْ يَذْكُرِ اسْمَ اللَّهِ تَعَالَى عَلَيْهِ " .
Narrated AbuHurayrah: The Messenger of Allah (ﷺ) 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.
Reference : Sunan Abi Dawud 101In-book reference : Book 1, Hadith 101English translation : Book 1, Hadith 101