Hadith 509
Chapter 72: Performing ablution for each prayer and offering all prayers in one ablution - كتاب الطهارة وسننها
حَدَّثَنَا سُوَيْدُ بْنُ سَعِيدٍ، حَدَّثَنَا شَرِيكٌ، عَنْ عَمْرِو بْنِ عَامِرٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ يَتَوَضَّأُ لِكُلِّ صَلاَةٍ وَكُنَّا نَحْنُ نُصَلِّي الصَّلَوَاتِ كُلَّهَا بِوُضُوءٍ وَاحِدٍ .
It was narrated that Anas bin Malik said:
"The Messenger of Allah used to perform ablution for every prayer, and we used to perform all of the prayers with one ablution."
Reference : Sunan Ibn Majah 509
In-book reference : Book 1, Hadith 243