Once Allah's Messenger (ﷺ) remained behind us in a journey. He joined us while we were performing ablution for the `Asr prayer which was over-due. We were just passing wet hands over our feet (not washing them properly) so the Prophet (ﷺ) addressed us in a loud voice and said twice or thrice, "Save your heels from the fire."
Reference: Sahih al-Bukhari 96 In-book : Book 3, Hadith 38 USC-MSA web (English) : Vol. 1, Book 3, Hadith 96 (deprecated)
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