Perform wudu' after engaging in permissible activities such as marital relations .

The hadith narrated by 'A'isha states that the Prophet Muhammad (PBUH) would perform wudu', or ablution, after having sexual intercourse before going to sleep. This is a sign of respect for Allah and His commands as well as a reminder of the importance of cleanliness and purity in Islam. It also serves as an example for Muslims to follow in their own lives; even after engaging in something permissible like marital relations, one should still take care to maintain their spiritual cleanliness and purity. Additionally, this hadith shows us that even small acts can have great significance when done with the intention of pleasing Allah.