Rasulullah berwudhu sekali sekali
Imam Bukhari : 153حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ قَالَ حَدَّثَنَا سُفْيَانُ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ عَنْ ابْنِ عَبَّاسٍ قَالَتَوَضَّأَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَرَّةً مَرَّةً
It was narrated to us by [Muhammad bin Yusuf] who said: It was narrated to us by [Sufyan] from [Zaid bin Aslam] from ['Atha' bin Yasar] from [Ibn 'Abbas] who said: 'The Prophet, peace and blessings be upon him, performed wudu once for each part.'
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