‘Uthman performed ablution, pouring water over his hands three times, then rinsing his mouth and snuffing up water, then washing his face three times, then washing his right arm up to the elbow three times, then washing his left arm up to the elbow three times, then wiping his head, then washing his right foot three times, then the left three times. He then said, “I have seen God’s messenger performing ablution as I have done it just now,” adding, “If anyone performs ablution as I have done, then prays two rak'as* without allowing his thoughts to be distracted, his past offences will be forgiven him.” *A section of the daily prayers. Each time of prayer has a specified number of rak'as (Bukhari and Muslim, the wording being Bukhari’s.)
Hadith Referenceمشكوة المصابيح / كتاب الطهارة / 287
Hadith Gradingالألبانی:متفق عليه | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (1934) و مسلم (3، 4/ 226)»