Bukhari :: Book 1 :: Volume 4 :: Hadith 164
Narrated 'Abdullah bin 'Amr:
The Prophet remained behind us on a journey. He joined us while we were performing ablution for the 'Asr prayer which was over-due and we were just passing wet hands over our feet (not washing them thoroughly) so he addressed us in a loud voice saying twice orthriae, "Save your heels from the fire."
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