Abu Huraira reported: Allah’s Apostle (may peace be upon him) saw a man who did not wash his heel and he remarked: Woe to the heels because of hell-fire.

Abu Huraira reported: Allah’s Apostle (may peace be upon him) saw a man who did not wash his heel and he remarked: Woe to the heels because of hell-fire.
Source: HOTD