Hamran bin Aban حمران بن أبان · The Book of Purification

"I saw 'Uthman bin 'Affan, may Allah be pleased with him, performing Wudu'. He poured water on his hands three times and washed them, then he rinsed his mouth and his nose, then he washed his face three times, then he washed his right arm to the elbow three times, then the left likewise. Then he wiped his head, then he washed his right foot three times, then the left likewise. Then he said: 'I saw the Messenger of Allah…

"I saw the Messenger of Allah (ﷺ) performing Wudu' like I have just done." Then he said: "Whoever performs Wudu' as I have done, then stands and prays two Rak'ahs without letting his thoughts wander, his previous sins will be forgiven.'"

"Uthman called for water for Wudu'. He washed his hands three times, then he rinsed his mouth and nose, then he washed his face three times, then washed his right hand up to the elbow three times. Then he washed his left hand likewise. Then he washed his left hand likewise. Then he wiped his head, then he washed his right foot up to the ankle three times, and he washed his left foot likewise, and he washed his left…

"I heard Humran bin Aban tell Abu Burdah in the Masjid that he heard 'Uthman narrating that the Messenger of Allah (ﷺ) said: 'Whoever performs Wudu' completely as commanded by Allah, the five daily prayers will be an expiation for whatever comes in between them.'"

"I heard the Messenger of Allah (ﷺ) say: 'There is no man who performs Wudu' and does it well, then prays, but when he prays it, he will be forgiven whatever (sins he commits) between that and the next prayer."