A man came to the Prophet ﷺ and asked him: Messenger of Allah, how is the ablution (to performed)? He (the Prophet) then called for water in a vessel and washed his hands up to the wrists three times, then washed his face three times, and washed his forearms three times. He then wiped his head and inserted both his index fingers in his ear-holes; he wiped the back of his ears with his thumbs and the front of his ears with the index fingers. He then washed his feet three times. Then he said: This is how ablution should be performed. If anyone does more or less than this, he has done wrong and transgressed, or (said) transgressed and done wrong. (Using translation from Abū Dāʾūd 135)   

أَنَّ رَجُلًا أَتَى النَّبِيَّ ﷺ فَقَالَ يَا رَسُولَ اللهِ كَيْفَ الطُّهُورُ؟ فَدَعَا بِمَاءٍ فِي إِنَاءٍ فَغَسَلَ كَفَّيْهِ ثَلَاثًا ثُمَّ غَسَلَ وَجْهَهُ ثَلَاثًا ثُمَّ غَسَلَ ذِرَاعَيْهِ ثَلَاثًا ثُمَّ مَسَحَ بِرَأْسِهِ فَأَدْخَلَ أُصْبُعَيْهِ السَّبَّاحَتَيْنِ فِي أُذُنَيْهِ وَمَسَحَ بِإِبْهَامَيْهِ عَلَى ظَاهِرِ أُذُنَيْهِ وَبِالسَّبَّاحَتَيْنِ بَاطِنَ أُذُنَيْهِ ثُمَّ غَسَلَ رِجْلَيْهِ ثَلَاثًا ثَلَاثًا ثُمَّ قَالَ هَكَذَا الْوُضُوءُ فَمَنْ زَادَ عَلَى هَذَا أَوْ نَقَصَ فَقَدْ أَسَاءَ وَظَلَمَ أَوْ ظَلَمَ وَأَسَاءَ قَوْلُهُ نَقَصَ يَحْتَمِلُ أَنْ يُرِيدَ بِهِ نُقْصَانَ الْعُضْوِ وَقَوْلُهُ ظَلَمَ يَعْنِي جَاوَزَ الْحَدَّ وَاللهُ أَعْلَمُ