"I heard Allah's Messenger saying: there is no Wudu for one who does not mention Allah's Name over it."
Jami` at-Tirmidhi Book 1, Hadith 25
← Previous Hadith Prophet said: "When on of you awakens in the night, then let him not put his hand into the vessel until he has poured water on two times, or three times, for indeed he does not know where his hand has spent the night."

Jami` at-Tirmidhi Book 1, Hadith 24 Next Hadith → the same from his grandmother the daughter of Sa'eed bin Zaid, from her father, from the Prophet.

Jami` at-Tirmidhi Book 1, Hadith 26