Humran reported,

I saw Uthman perform ablution. He poured water over his hands three times, then rinsed his mouth and blew water out of his nose, then washed his face three times, then washed his right arm up to the elbow three times, then his left arm up to the elbow three times, then wiped his head, then washed his right foot three times, and then his left foot three times.Then he said, "I saw the Messenger of Allah ﷺ perform ablution just as I have performed it, and then he said, 'Whoever performs ablution as I have done, then prays two units of prayer without letting his mind wander during them, his past sins will be forgiven.'"

حدثنا عبدان أخبرنا عبد الله أخبرنا معمر قال حدثني الزهري عن عطاء بن يزيد

عن حمران

رأيت عثمان رضي الله عنه توضأ فأفرغ على يديه ثلاثا ثم تمضمض واستنثر ثم غسل وجهه ثلاثا ثم غسل يده اليمنى إلى المرفق ثلاثا ثم غسل يده اليسرى إلى المرفق ثلاثا ثم مسح برأسه ثم غسل رجله اليمنى ثلاثا ثم اليسرى ثلاثا ثم قال رأيت رسول الله ﷺ توضأ نحو وضوئي هذا ثم قال من توضأ وضوئي هذا ثم يصلي ركعتين لا يحدث نفسه فيهما بشيء إلا غفر له ما تقدم من ذنبه