Sahih Muslim
242.01

Abu 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

242.02

Abu Huraira reported:He saw people perform ablution with the help of a water jar and he said: Complete the Wudu for i heard Abu al-Qasim (ﷺ) say: Woe to the hamstrings because of hell-fire

242.03

Abu Huraira reported:The Messenger of Allah (ﷺ) said: Woe to the heels because of hell-fire