Sunan Ibn Majah 422
It was narrated from 'Amr bin Shu'aib from his father, from his grandfather, that:
A Bedouin came to the Prophet and asked him about ablution. He showed him how to perform it washing each part of the body three times. Then he said: 'This is the ablution, and whoever does more than this, has done evil, transgressed the limits and wronged himself.'"
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا خَالِي، يَعْلَى عَنْ سُفْيَانَ، عَنْ مُوسَى بْنِ أَبِي عَائِشَةَ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ جَاءَ أَعْرَابِيٌّ إِلَى النَّبِيِّ ـ صلى الله عليه وسلم ـ فَسَأَلَهُ عَنِ الْوُضُوءِ فَأَرَاهُ ثَلاَثًا ثَلاَثًا ثُمَّ قَالَ ‏
"‏ هَذَا الْوُضُوءُ فَمَنْ زَادَ عَلَى هَذَا فَقَدْ أَسَاءَ وَتَعَدَّى أَوْ ظَلَمَ ‏"‏ ‏.‏