Perform wudu and wash your penis before sleeping if you become junbun at night .

This hadith is about the importance of cleanliness and hygiene. It was narrated by Ibn 'Umar that the Prophet Muhammad (PBUH) advised Umar to perform wudu and wash his penis before sleeping if he became junub at night. This hadith teaches us that it is important to maintain cleanliness in our lives as Muslims. We should always strive to keep ourselves clean and practice good hygiene habits such as washing our hands regularly or taking a shower after becoming junub. Additionally, this hadith also emphasizes the importance of following the teachings of Prophet Muhammad (PBUH). We should always strive to follow his teachings in order to lead a life according to Islamic principles.