Sunan Ibn Majah Book 1, Hadith 190

"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.'"

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They all heard the Messenger of Allah say: 'Complete the ablution. Woe to the heels because of Hell-fire."

Sunan Ibn Majah Book 1, Hadith 189
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The Messenger of Allah performed ablution; so he washed his feet three times.

Sunan Ibn Majah Book 1, Hadith 191