Cover your mouth when you yawn using your hand .

This hadith is about the importance of covering your mouth when you yawn. The Prophet Muhammad ﷺ taught that when we yawn, we should cover our mouths with our hands to prevent the devil from entering in. This teaches us that even something as small as a yawn can be an opportunity for evil and so it is important to take precautions against it by covering our mouths with our hands. It also teaches us that we must always be aware of the presence of evil and take steps to protect ourselves from it in all aspects of life, even if they seem small or insignificant.