Sulaiman bin Buraidah narrated that his father said:"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

English translation · Jami' at-Tirmidhi