Sunan Ibn Majah #509 · The Book of Purification and its Sunnah

Sunan Ibn MajahIt was narrated that Anas bin Malik said
Sunan Ibn Majah · Book 1 · The Book of Purification and its Sunnah
Sunan Ibn Majah · كتاب 1 · كتاب الطهارة وسننها
"The Messenger of Allah used to perform ablution for every prayer, and we used to perform all of the prayers with one ablution
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 ‏.‏
Reference : Sunan Ibn Majah 509In-book reference : Book 1, Hadith 243