Someone said to Abdul-Rahman bin Abu Bakr, "Perform the ablution thoroughly, for I heard the Messenger of Allah ﷺ say, 'Woe to the heels from the Fire.'"
حدثنا هاشم قال حدثنا أبو معاوية يعني شيبان عن يحيى عن سالم مولى دوس أنه
لعبد الرحمن بن أبي بكر أسبغ الوضوء فإني سمعت رسول الله ﷺ يقول ويل للأعقاب من النار
Its isnad is sahih. Salim, freedman of Daws, is Salim bin Abdullah Nasri, and he is trustworthy, his hadith is found in Muslim. He is also called Salim, freedman of the Nasris, and freedman of Dawsi, and freedman of Shaddad. And Salim Sablan. This hadith has occurred frequently. See 24005.