Musnad Ahmad 418, 419
It was narrated that Humran said, `Uthman (رضي الله عنه) called for water when he was in al-Maqa`id. He poured some on his right hand and washed it, then he put his right hand in the vessel and washed his hands three times, then he washed his face three times, and he rinsed his mouth and nose, he washed his arms up to the elbows three times, then he wiped his head, then he washed his feet up to the ankles three times. Then he said:
It was narrated from Humran, the freed slave of ‘Uthman, that he saw `Uthman (رضي الله عنه) call for a vessel,... and he mentioned a similar report.
حَدَّثَنَا أَبُو كَامِلٍ، حَدَّثَنَا إِبْرَاهِيمُ يَعْنِي ابْنَ سَعْدٍ، حَدَّثَنَا ابْنُ شِهَابٍ، عَنْ عَطَاءِ بْنِ يَزِيدَ، عَنْ حُمْرَانَ، قَالَ دَعَا عُثْمَانُ رَضِيَ اللَّهُ عَنْهُ بِمَاءٍ وَهُوَ عَلَى الْمَقَاعِدِ فَسَكَبَ عَلَى يَمِينِهِ فَغَسَلَهَا ثُمَّ أَدْخَلَ يَمِينَهُ فِي الْإِنَاءِ فَغَسَلَ كَفَّيْهِ ثَلَاثًا ثُمَّ غَسَلَ وَجْهَهُ ثَلَاثَ مِرَارٍ وَمَضْمَضَ وَاسْتَنْثَرَ وَغَسَلَ ذِرَاعَيْهِ إِلَى الْمِرْفَقَيْنِ ثَلَاثَ مَرَّاتٍ ثُمَّ مَسَحَ بِرَأْسِهِ ثُمَّ غَسَلَ رِجْلَيْهِ إِلَى الْكَعْبَيْنِ ثَلَاثَ مِرَارٍ ثُمَّ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ مَنْ تَوَضَّأَ نَحْوَ وُضُوئِي هَذَا ثُمَّ صَلَّى رَكْعَتَيْنِ لَا يُحَدِّثُ نَفْسَهُ فِيهِمَا غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ حَدَّثَنَا إِبْرَاهِيمُ بْنُ نَصْرٍ التِّرْمِذِيُّ حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ عَنِ ابْنِ شِهَابٍ عَنْ عَطَاءِ بْنِ يَزِيدَ عَنْ حُمْرَانَ مَوْلَى عُثْمَانَ أَنَّهُ رَأَى عُثْمَانَ رَضِيَ اللَّهُ عَنْهُ دَعَا بِإِنَاءٍ فَذَكَرَ نَحْوَهُ‏.‏