Humran bin Abban reported,

I saw Uthman bin Affan perform ablution. He poured water over his hands three times and washed them, then he rinsed his mouth and blew water out of his nose. Then he washed his face three times, then washed his right arm up to the elbow three times, then his left in the same manner. Then he wiped his head, then washed his right foot three times, then his left in the same manner.He then said, "I saw the Messenger of Allah ﷺ perform ablution similar to this ablution of mine, and he said, 'Whoever performs ablution like this ablution of mine and then prays two units of prayer without letting his mind wander during them, his previous sins will be forgiven.'"

حدثنا عبد الرزاق أنبأنا معمر عن الزهري عن عطاء بن يزيد الليثي

عن حمران بن أبان قال

رأيت عثمان بن عفان رضي الله عنه توضأ فأفرغ على يديه ثلاثا فغسلهما ثم مضمض واستنثر ثم غسل وجهه ثلاثا ثم غسل يده اليمنى إلى المرفق ثلاثا ثم اليسرى مثل ذلك ثم مسح برأسه ثم غسل قدمه اليمنى ثلاثا ثم اليسرى مثل ذلك قال رأيت رسول الله ﷺ توضأ نحوا من وضوئي هذا ثم قال من توضأ وضوئي هذا ثم صلى ركعتين لا يحدث فيهما نفسه غفر له ما تقدم من ذنبه