Perform ablution before going to sleep

This hadith is about the importance of performing ablution, or wudoo, before going to sleep. It was narrated by Ali bin Abi Talib, a companion of the Prophet Muhammad. The hadith compares the eye and anus to a string that ties up a waterskin; just as it is important to tie up the waterskin so that its contents do not spill out, it is important for one to perform wudoo before sleeping in order to maintain cleanliness and purity. This hadith teaches us that we should take care of our physical hygiene and cleanliness even when we are tired or sleepy. It also reminds us of our responsibility towards maintaining spiritual purity by performing wudoo regularly.