Sahih Bukhari Volume 001, Book 003, Hadith Number 096.

Narated By 'Abdullah bin 'Amr : Once Allah's Apostle 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 addressed us in a loud voice and said twice or thrice, "Save your heels from the fire."

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