Ask for permission before entering someone else's property or belongings

This hadith is about the importance of asking permission before looking at something. It was narrated by Sa'd, who said that he saw the Prophet scratching his head with a Midrai comb. When the Prophet noticed him, he said that if he had known earlier, he would have pierced his eye with it as a reminder to ask for permission before looking at something unlawfully. This teaches us to respect other people's privacy and not to look at things without their consent or knowledge. We must always remember to ask for permission before entering someone else's house or looking into their belongings without them knowing about it first.