Reference: Sahih Bukhari (English),Volume 01,03. Knowledge,Hadith 057:- Narrated `Abdullah bin `Amr: Once the Prophet remained behind us in a journey. He joined us while we were performing ablution for the prayer which was over-due. We were just passing wet hands over our feet (and not washing them properly) so the Prophet addressed us in a loud voice and said twice or thrice: "Save your heels from the fire." - #Hamras -

Reference: Sahih Bukhari (English),Volume 01,03. Knowledge,Hadith 057:- Narrated `Abdullah bin `Amr: Once the Prophet remained behind us in a journey. He joined us while we were performing ablution for the prayer which was over-due. We were just passing wet hands over our feet (and not washing them properly) so the Prophet addressed us in a loud voice and said twice or thrice: "Save your heels from the fire."