The Prophet ﷺ used to perform ablution before every prayer.Amr bin Amir asked, "What did you used to do?"He replied, "One ablution was sufficient for us as long as we did not break it."
كان النبي يتوضأ عند كل صلاة. قال عمرو بن عامر: كيف كنتم تصنعون؟ قال: يجزئ أحدنا الوضوء ما لم يحدث.
Bukhari narrated it in the Book of Wudu (214), from Muhammad bin Yusuf, who said, Sufyan narrated to us, from Amr bin Amir, who said, I heard Anas... and he related the hadith. And in Tirmidhi (58), via the route of Humayd, from Anas, "whether pure or impure."And in the chapter on the tooth-stick is the hadith of Abdullah bin Hanzala bin Abu Amir Ghasil, that the Messenger of Allah ﷺ had commanded wudu before every prayer, whether one was pure or impure. But when that became burdensome for the Messenger of Allah ﷺ, he commanded the use of the tooth-stick before every prayer, and lifted the obligation of wudu from him except for one in a state of impurity.Perhaps that was in adherence to the words of Allah, Most High, "O you who believe, when you rise to pray..." [Maidah 5:6], and it was then made lighter, so that wudu was required only of the one in a state of impurity.Abu Ubayd Qasim bin Salam said in Tahur (p. 138), "There is no wudu except for one in a state of impurity, and this is what is practiced among us, and it is followed by the people of Hijaz and Iraq, because it was the last of the Prophet's ﷺ actions that we mentioned from him on the day of the Conquest" (this is the hadith of Sulayman bin Burayda, which will follow), "and the Muslims act upon it, and renewing the wudu is simply a matter of merit, like what we narrated from Ibn Umar, from the Prophet ﷺ, at the beginning of the chapter, but as an obligation, no."