Musnad Ahmad
It was narrated that `Uthman said: I saw the Messenger of Allah (ﷺ) do wudoo’: he washed his face three times and his hands three times, and he washed his arms three times each, and wiped his head, and washed his feet thoroughly.
حَدَّثَنَا عَبْد اللَّهِ، حَدَّثَنِي مُحَمَّدُ بْنُ أَبِي بَكْرٍ الْمُقَدَّمِيُّ، وَأَبُو الرَّبِيعِ الزَّهْرَانِيُّ، قَالَا حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنِ الْحَجَّاجِ، عَنْ عَطَاءٍ، عَنْ عُثْمَانَ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ تَوَضَّأَ فَغَسَلَ وَجْهَهُ ثَلَاثًا وَيَدَيْهِ ثَلَاثًا وَغَسَلَ ذِرَاعَيْهِ ثَلَاثًا ثَلَاثًا وَمَسَحَ بِرَأْسِهِ وَغَسَلَ رِجْلَيْهِ غَسْلًا.
Grade: Sahih hadeeth, this isnad is Da'if] (Darussalam)
Reference