Sunan Abi Dawud 172
Buraidah on the authority of his father reported:
The Messenger of Allah (ﷺ) performed five prayers with the same ablution of the occasion of the capture of Mecca, and he wiped over his socks.  ‘Umar said to him(the Prophet): I saw you doing a thing today that you never did. He said: I did it deliberately.
حَدَّثَنَا مُسَدَّدٌ، أَخْبَرَنَا يَحْيَى، عَنْ سُفْيَانَ، حَدَّثَنِي عَلْقَمَةُ بْنُ مَرْثَدٍ، عَنْ سُلَيْمَانَ بْنِ بُرَيْدَةَ، عَنْ أَبِيهِ، قَالَ صَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم يَوْمَ الْفَتْحِ خَمْسَ صَلَوَاتٍ بِوُضُوءٍ وَاحِدٍ وَمَسَحَ عَلَى خُفَّيْهِ فَقَالَ لَهُ عُمَرُ إِنِّي رَأَيْتُكَ صَنَعْتَ الْيَوْمَ شَيْئًا لَمْ تَكُنْ تَصْنَعُهُ ‏.‏ قَالَ ‏
"‏ عَمْدًا صَنَعْتُهُ ‏"‏ ‏.‏