Show respect for Allah's house by being mindful of your actions in it .

This hadith speaks about saluting the corner when entering or leaving a room. It was narrated by Hisham ibn Urwa from his father that the Prophet Muhammad ﷺ asked Abd ar-Rahman ibn Awf what he did when saluting the corner and Abd ar-Rahman said sometimes he does and sometimes he doesn't. The Prophet ﷺ then said that he was right in doing so, implying that it is not mandatory to salute the corner but it is a good practice to do so as an act of respect for Allah's house. This hadith teaches us to be respectful of our surroundings and to show reverence for Allah's house even if we are not required to do something specific like saluting the corner.