Sunan an-Nasa'i 140
It was narrated from 'Amr bin Shu'aib, from his father, that his grandfather said:
"A Bedouin came to the Prophet (ﷺ) to ask him about Wudu', so he showed him how to perform Wudu', washing each part three times, then he said: 'This is Wudu'. Whoever does more than that has done badly, done to extremes and done wrong.'"
أَخْبَرَنَا مَحْمُودُ بْنُ غَيْلاَنَ، قَالَ حَدَّثَنَا يَعْلَى، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ مُوسَى بْنِ أَبِي عَائِشَةَ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ جَاءَ أَعْرَابِيٌّ إِلَى النَّبِيِّ صلى الله عليه وسلم يَسْأَلُهُ عَنِ الْوُضُوءِ فَأَرَاهُ الْوُضُوءَ ثَلاَثًا ثَلاَثًا ثُمَّ قَالَ ‏
"‏ هَكَذَا الْوُضُوءُ فَمَنْ زَادَ عَلَى هَذَا فَقَدْ أَسَاءَ وَتَعَدَّى وَظَلَمَ ‏"‏ ‏.‏