Respond politely to those who greet you first. Be mindful of your appearance when going out in public. Show respect for others at all times.

This hadith is about the importance of returning salams when someone greets you. It is narrated by Abdullah bin Amr that a man wearing two red garments passed by the Prophet and gave him salam, but the Prophet did not return it. This teaches us that we should always be courteous and polite to others, especially when they greet us first. We should always respond to their greeting with a warm smile or kind words in order to show respect for them. Additionally, this hadith also teaches us that we should be mindful of our appearance when going out in public as it can have an effect on how people perceive us and how they treat us in return.