the Prophet said: "Whoever performs Wudu while in a state of purity, Allah writes for him on account of it ten good merits."
Jami` at-Tirmidhi Book 1, Hadith 59
← Previous 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 Next Hadith → "The Prophet would perform Wudu for every Salat." I said, "So what about you, what would you do?" He said I wouId pray all of the prayers with one Wudu, as long as we had not committed Hadath (anything that invalidates Wudu)."

Jami` at-Tirmidhi Book 1, Hadith 60