"The Prophet would perform Wudu for every Salat. So during the year of the Conquest, he performed all of the prayers with one Wudu, and he wiped over his Khuff. So Umar said, 'You did something that you have not done before?' He replied: "I did it on purpose."  

كَانَ النَّبِيُّ ﷺ يَتَوَضَّأُ لِكُلِّ صَلاَةٍ فَلَمَّا كَانَ عَامُ الْفَتْحِ صَلَّى الصَّلَوَاتِ كُلَّهَا بِوُضُوءٍ وَاحِدٍ وَمَسَحَ عَلَى خُفَّيْهِ فَقَالَ عُمَرُ إِنَّكَ فَعَلْتَ شَيْئًا لَمْ تَكُنْ فَعَلْتَهُ قَالَ عَمْدًا فَعَلْتُهُ