Abu Hayyah said:
I saw ‘Ali perform ablution. He (Abu Hayyah) then described that ‘Ali went through every part of the ablution three times, i.e. he performed each detail of his ablution three times. He then wiped his head, then washed his feet up to the ankles. He then said: I wanted to show you how the Messenger of Allah ﷺ performed ablution.

حَدَّثَنَا مُسَدَّدٌ، وَأَبُو تَوْبَةَ قَالاَ حَدَّثَنَا أَبُو الأَحْوَصِ، ح وَحَدَّثَنَا عَمْرُو بْنُ عَوْنٍ، أَخْبَرَنَا أَبُو الأَحْوَصِ، عَنْ أَبِي إِسْحَاقَ، عَنْ أَبِي حَيَّةَ، قَالَ رَأَيْتُ عَلِيًّا - رضى الله عنه - تَوَضَّأَ فَذَكَرَ وُضُوءَهُ كُلَّهُ ثَلاَثًا ثَلاَثًا - قَالَ - ثُمَّ مَسَحَ رَأْسَهُ ثُمَّ غَسَلَ رِجْلَيْهِ إِلَى الْكَعْبَيْنِ ثُمَّ قَالَ إِنَّمَا أَحْبَبْتُ أَنْ أُرِيَكُمْ طُهُورَ رَسُولِ اللَّهِ ﷺ .