Humran reported,

Uthman called for water while he was sitting on the bench. He poured some onto his right hand and washed it, then dipped his right hand into the vessel and washed both his hands three times. He then washed his face three times, rinsed his mouth, and blew water out of his nose. He washed his arms up to the elbows three times, then wiped his head, then washed his feet up to the ankles three times.Then he said, "I heard the Messenger of Allah ﷺ say, 'Whoever performs ablution like this ablution of mine, then prays two units of prayer without letting his mind wander during them, his previous sins will be forgiven.'"

حدثنا أبو كامل حدثنا إبراهيم يعني ابن سعد حدثنا ابن شهاب عن عطاء بن يزيد

عن حمران قال

دعا عثمان رضي الله عنه بماء وهو على المقاعد فسكب على يمينه فغسلها ثم أدخل يمينه في الإناء فغسل كفيه ثلاثا ثم غسل وجهه ثلاث مرار ومضمض واستنثر وغسل ذراعيه إلى المرفقين ثلاث مرات ثم مسح برأسه ثم غسل رجليه إلى الكعبين ثلاث مرار ثم قال سمعت رسول الله ﷺ يقول من توضأ نحو وضوئي هذا ثم صلى ركعتين لا يحدث نفسه فيهما غفر له ما تقدم من ذنبه