Rasulullah berwudhu sekali sekali
Imam Ahmad : 146حَدَّثَنَا يَحْيَى بْنُ غَيْلَانَ حَدَّثَنَا رِشْدِينُ بْنُ سَعْدٍ حَدَّثَنِي أَبُو عَبْدِ اللَّهِ الْغَافِقِيُّ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ أَبِيهِ عَنْ عُمَرَ بْنِ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنَّهُ تَوَضَّأَ عَامَ تَبُوكَ وَاحِدَةً وَاحِدَةً
Narrated to us [Yahya Bin Ghailan] Narrated to us [Risydin Bin Sa'd] Has told me [Abu Abdullah Al Ghafiqi] from [Zaid Bin Aslam] from [his father] from [Umar Bin Al Khaththab] from the Messenger of Allah shallallahu 'alaihi wasallam, that he performed ablution on the battle of Tabuk once.
Hadith Corroboration :
Imam Ahmad : 144, 146, 550, 831, 966, 1296, 1968, 2291, 2913, 15106, 15845, 15869, 17381, 25782, 25786
Imam Bukhari : 137, 153
Imam Abu Dawud : 102, 104, 106, 109, 110, 111, 113, 118, 119, 120
Imam Tirmidzi : 32, 40
Imam Nasa'i : 79, 100, 101
Imam Ibnu Majah : 397, 399, 405, 406, 429, 430, 431, 437, 438, 439
Imam Darimi : 693, 705