question #1 Sahih al-Bukhari 163, Book 4, Hadith 29 : What is the significance of properly performing ablution in Islam?

The Prophet (ﷺ) remained behind us on a journey. He joined us while we were performing ablution for the
`Asr prayer which was overdue and we were just passing wet hands over our feet (not washing them
thoroughly) so he addressed us in a loud voice saying twice , “Save your heels from the fire.”