حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا عُمَرُ بْنُ عُبَيْدٍ، عَنْ عُمَرَ بْنِ الْمُثَنَّى، عَنْ عَطَاءٍ الْخُرَاسَانِيِّ، عَنْ أَنَسٍ، قَالَ كُنْتُ مَعَ النَّبِيِّ ـ صلى الله عليه وسلم ـ فِي سَفَرٍ فَتَنَحَّى لِحَاجَتِهِ ثُمَّ جَاءَ فَدَعَا بِوَضُوءٍ فَتَوَضَّأَ ‏.‏

It was narrated that Anas said: "I was with the Prophet on a journey. He went away to relieve himself, then he came and called for water and performed ablution." Translation Not Available

Book Ref: Sunan Ibn Majah Book 1 Hadith 332
Web Ref:  Sunan Ibn Majah Vol 1 Book 1 Hadith 332