Sunan Abi Dawud 106
Humran b. Abban, the freed slave of ‘Uthman, said :
I saw ‘ Uthman’ b. ‘Affan while he performed ablution. He poured water over his hands three times and  then washed them. He then rinsed his mouth and then cleansed his nose with water (three times). He then washed his right arm up to the elbow three times, then washed his left arm in a similar manner; then wiped his head; then washed  his right foot three times, then washed his left foot in a similar manner, and then said : I saw the Messenger of Allah (ﷺ) performing ablution like this ablution of mine. Then he (the Prophet) said: He who performs ablution like this ablution of mine and then offered two rakhahs of prayer without allowing his thoughts to be distracted, Allah will pardon all his past sins.
حَدَّثَنَا الْحَسَنُ بْنُ عَلِيٍّ الْحُلْوَانِيُّ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ عَطَاءِ بْنِ يَزِيدَ اللَّيْثِيِّ، عَنْ حُمْرَانَ بْنِ أَبَانَ، مَوْلَى عُثْمَانَ بْنِ عَفَّانَ قَالَ رَأَيْتُ عُثْمَانَ بْنَ عَفَّانَ تَوَضَّأَ فَأَفْرَغَ عَلَى يَدَيْهِ ثَلاَثًا فَغَسَلَهُمَا ثُمَّ تَمَضْمَضَ وَاسْتَنْثَرَ ثُمَّ غَسَلَ وَجْهَهُ ثَلاَثًا وَغَسَلَ يَدَهُ الْيُمْنَى إِلَى الْمِرْفَقِ ثَلاَثًا ثُمَّ الْيُسْرَى مِثْلَ ذَلِكَ ثُمَّ مَسَحَ رَأْسَهُ ثُمَّ غَسَلَ قَدَمَهُ الْيُمْنَى ثَلاَثًا ثُمَّ الْيُسْرَى مِثْلَ ذَلِكَ ثُمَّ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم تَوَضَّأَ مِثْلَ وُضُوئِي هَذَا ثُمَّ قَالَ ‏
"‏ مَنْ تَوَضَّأَ مِثْلَ وُضُوئِي هَذَا ثُمَّ صَلَّى رَكْعَتَيْنِ لاَ يُحَدِّثُ فِيهِمَا نَفْسَهُ غَفَرَ اللَّهُ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ ‏"‏ ‏.‏