Perform ablution when one hears a sound or smells something

This hadith explains the importance of performing ablution, which is an Islamic ritual that involves washing certain parts of the body with water. According to this hadith, it is necessary to perform ablution when one hears a sound or smells something. This shows that Muslims should be mindful and take care of their hygiene even in small matters such as hearing a sound or smelling something. It also teaches us to be conscious about our environment and take care of our surroundings by keeping them clean and hygienic.