Sunan an-Nasa'i 84
It was narrated that Humran bin Aban said:
"I saw 'Uthman bin 'Affan, may Allah be pleased with him, performing Wudu'. He poured water on his hands three times and washed them, then he rinsed his mouth and his nose, then he washed his face three times, then he washed his right arm to the elbow three times, then the left likewise. Then he wiped his head, then he washed his right foot three times, then the left likewise. Then he said: 'I saw the Messenger of Allah (ﷺ) performing Wudu' like I have just done. Then he said: 'Whoever performs Wudu' as I have done, then prays two rak'ahs without letting his thoughts wander, his previous sins will be forgiven.'"
أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ مَعْمَرٍ، عَنِ الزُّهْرِيِّ، عَنْ عَطَاءِ بْنِ يَزِيدَ اللَّيْثِيِّ، عَنْ حُمْرَانَ بْنِ أَبَانَ، قَالَ رَأَيْتُ عُثْمَانَ بْنَ عَفَّانَ - رضى الله عنه - تَوَضَّأَ فَأَفْرَغَ عَلَى يَدَيْهِ ثَلاَثًا فَغَسَلَهُمَا ثُمَّ تَمَضْمَضَ وَاسْتَنْشَقَ ثُمَّ غَسَلَ وَجْهَهُ ثَلاَثًا ثُمَّ غَسَلَ يَدَهُ الْيُمْنَى إِلَى الْمِرْفَقِ ثَلاَثًا ثُمَّ الْيُسْرَى مِثْلَ ذَلِكَ ثُمَّ مَسَحَ بِرَأْسِهِ ثُمَّ غَسَلَ قَدَمَهُ الْيُمْنَى ثَلاَثًا ثُمَّ الْيُسْرَى مِثْلَ ذَلِكَ ثُمَّ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم تَوَضَّأَ نَحْوَ وُضُوئِي ثُمَّ قَالَ ‏
"‏ مَنْ تَوَضَّأَ نَحْوَ وُضُوئِي هَذَا ثُمَّ صَلَّى رَكْعَتَيْنِ لاَ يُحَدِّثُ نَفْسَهُ فِيهِمَا بِشَىْءٍ غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ ‏"‏ ‏.‏