Rasulullah berwudhu sekali sekali
Imam Darimi : 693أَخْبَرَنَا أَبُو الْوَلِيدِ حَدَّثَنِي عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ الدَّرَاوَرْدِيُّ حَدَّثَنَا زَيْدُ بْنُ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ عَنْ ابْنِ عَبَّاسٍ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ تَوَضَّأَ مَرَّةً مَرَّةً جَمَعَ بَيْنَ الْمَضْمَضَةِ وَالِاسْتِنْشَاقِ
"Narrated to us [Abu Al Walid] Narrated to me [Abdul Aziz bin Muhammad Ad Darawardi] Narrated to us [Zaid bin Aslam] from ['Atha` bin Yasar] from [Ibn Abbas] May Allah be pleased with him The Prophet Peace be upon him used to perform ablution once in a while, and he combined gargling and putting water in the nose."
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