Rasulullah berwudhu sekali sekali
Imam Ahmad : 2913حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا دَاوُدُ بْنُ قَيْسٍ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ عَنِ ابْنِ عَبَّاسٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ تَوَضَّأَ مَرَّةً مَرَّةً
Narrated to us [Abdurrazaq] has informed us [Dawud bin Qais] from [Zaid bin Aslam] from ['Atha` bin Yasar] from [Ibn Abbas] that the Messenger of Allah shallallahu 'alaihi wasallam once performed ablution 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