It was narrated that Humran the freed slave of Uthman said:
"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 foot likewise. Then he said: 'I saw the Messenger of Allah (peace be upon him) performing Wudu' as I have just done.' Then he said: "The Messenger of Allah (peace be upon him) said: 'Whoever performs Wudu as I have just done, then prayes two Rakahs without letting his thoughts wander, his previous sins will be forgiven.'"
His full name is Humran bin Khalid bin Amr. Khalid bin Al-Walid captured him at Ayni Tamr. Khalid ibn al-Walid saw Humran's vigilance and prudence and gave it to Uthman bin Affan. He freed him from bondage and made him a secretary and watchman.
Humran was the governor of Nisabur during Hajjaj. He died on the 75th hijri rear.
According to our scholars, this hadith is the most authentic hadith regarding the quality of ablution and its ruling. In this hadith, one of the closest companions of the Prophet (peace be upon him), the third of the four Khalifas, brought water in front of many people and performed the wudu as the Prophet (peace and blessings of Allah be upon him). He then added in addition and uttered the words promoting the ablution.