Sahih Muslim 573
صحيح مسلم#573SahihAbu Huraira reported:Allah's Apostle (ﷺ) saw a man who did not wash his heel and he remarked: Woe to the heels because of hell-fire
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 2:40