the Prophet said: "Indeed there is a Shaitan for Wudu' who is called "AI-Walahan." So beware of having misgivings about water."
Jami` at-Tirmidhi Book 1, Hadith 57
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Jami` at-Tirmidhi Book 1, Hadith 56 Next Hadith → "The Prophet would perform wudu for every Salat, whether he was in state of purity or not in a state of purity."

Jami` at-Tirmidhi Book 1, Hadith 58