"The Messenger of Allah ﷺ used to perform Wudu' for every prayer. One the day of the Conquest (of Makkah), he offered all the prayers with one Wudu'. 'Umar said to him: 'You have done something that you never did before.' He said: 'I did that deliberately, O 'Umar.'" (Using translation from Nasāʾī 133)  

كَانَ رَسُولُ اللهِ ﷺ يَتَوَضَّأُ لِكُلِّ صَلَاةٍ فَلَمَّا كَانَ يَوْمُ الْفَتْحِ صَلَّى الصَّلَوَاتُ بِوُضُوءٍ وَاحِدٍ فَقَالَ لَهُ عُمَرُ فَعَلْتَ شَيْئًا لَمْ تَكُنْ تَفْعَلُهُ فَقَالَ «عَمْدًا فَعَلْتُهُ يَا عُمَرُ»