Sunan Abi Dawud 97
سنن أبي داود#97Sahih‘Abd Allah b. ‘Amr reported :The Messenger of Allah (ﷺ) saw some people (performing ablution) while their heels were dry. He then said : Woe to the heels because of Hell. Perform the ablution in full
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih Muslim (241)
In-book reference: 1:97