Sunan Ibn Majah 456
سنن ابن ماجه#456Sahihحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو الأَحْوَصِ، عَنْ أَبِي إِسْحَاقَ، عَنْ أَبِي حَيَّةَ، قَالَ رَأَيْتُ عَلِيًّا تَوَضَّأَ فَغَسَلَ قَدَمَيْهِ إِلَى الْكَعْبَيْنِ ثُمَّ قَالَ أَرَدْتُ أَنْ أُرِيَكُمْ طُهُورَ نَبِيِّكُمْ ـ صلى الله عليه وسلم ـ .
It was narrated that Abu Haiyah said:"I saw 'Ali performing ablution and he washed his feet up to the ankles, then he said: 'I wanted to show you how your Prophet purified himself
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Zubair Ali ZaiSahih
In-book reference: 1:190