Narrated by:'Umar said
It was narrated that 'Umar said:"I saw the Messenger of Allah during the campaign of Tabuk performing ablution, washing each part once."
حَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا رِشْدِينُ بْنُ سَعْدٍ، أَنْبَأَنَا الضَّحَّاكُ بْنُ شُرَحْبِيلَ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ أَبِيهِ، عَنْ عُمَرَ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ فِي غَزْوَةِ تَبُوكَ تَوَضَّأَ وَاحِدَةً وَاحِدَةً .
IbnMaja
The Book of Purification and its Sunnah • Hadith 412